DANB CDA – RHS: Infection Prevention and Control

Which components of the dental x-ray unit should be disinfected or barrier-protected between patients?

The tube head, PID, exposure button, control panel, and positioning device components that are touched during the procedure

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Only the tube head

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Only the exposure button

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No components need disinfection since the x-ray beam sterilizes the equipment

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A dental assistant is preparing the x-ray room for the next patient. The tube head and PID were not covered with barriers during the previous patient’s radiographic examination. What must the assistant do?

Clean and disinfect all surfaces that were touched during the procedure using an EPA-registered intermediate-level disinfectant

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Simply place barriers on the surfaces for the next patient without disinfecting

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Wipe the surfaces with a dry cloth

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No action is needed since the previous patient appeared healthy

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What level of disinfectant is recommended for clinical contact surfaces in the radiographic operatory?

Intermediate-level (hospital-grade, tuberculocidal) EPA-registered disinfectant

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Low-level disinfectant (non-tuberculocidal)

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Sterilant-level chemical (glutaraldehyde)

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Plain soap and water

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What is the purpose of placing barriers on x-ray equipment before beginning radiographic procedures?

To prevent contamination of equipment surfaces, eliminating the need for cleaning and disinfection between patients

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To improve image quality

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To reduce radiation exposure to the patient

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To prevent equipment from overheating

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During radiographic procedures, the dental assistant needs to touch the computer keyboard to capture images. The assistant’s gloves are contaminated from handling the sensor in the patient’s mouth. What barrier or technique should be used?

Cover the keyboard with a barrier before the procedure, or use overgloves when touching the keyboard

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Touch the keyboard with contaminated gloves since it will be cleaned later

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Remove gloves, touch the keyboard with bare hands, then put gloves back on without washing

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Ask the patient to press the keyboard keys

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Which of the following items used in radiography should receive barrier protection?

The exposure button, tube head, PID, chair headrest, and beam alignment device components

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The lead apron only

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The image itself

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The processing solutions

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How should a digital sensor (CCD/CMOS) be protected from contamination during intraoral use?

Cover the sensor with an FDA-cleared disposable barrier (sensor sleeve) before placing it in the patient's mouth

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Wipe the sensor with alcohol before and after use without a barrier

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Sterilize the sensor in the autoclave between patients

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No protection is needed for digital sensors

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After removing a digital sensor from a patient’s mouth, the dental assistant removes the barrier and notices saliva on the sensor surface. What should the assistant do?

Disinfect the sensor according to the manufacturer's guidelines, as the barrier was compromised

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Use the sensor for the next patient without cleaning it

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Sterilize the sensor in the autoclave

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Discard the sensor and use a new one

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How should phosphor storage plate (PSP) barriers be handled after intraoral use?

Remove the barrier carefully, avoiding contamination of the plate, then feed the plate into the scanner without touching the active surface with contaminated gloves

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Remove the plate from the barrier with contaminated gloves and scan immediately

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Autoclave the PSP plate after each use

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Discard the plate after a single use

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In offices still using conventional film, what is the infection control protocol for handling exposed film packets in the darkroom?

Open the contaminated film packets with contaminated gloves, drop the films onto a clean surface without touching them, remove gloves, wash hands, then handle the clean films with bare or clean-gloved hands for processing

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Process the films while wearing the same contaminated gloves used during exposure

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Rinse the film packets under water and open them with bare hands

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No infection control measures are needed in the darkroom

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A dental assistant processes film in a daylight loader attached to an automatic processor. After opening contaminated film packets inside the loader with gloved hands, what step must the assistant take before feeding the films into the processor?

Remove the contaminated gloves inside the loader, then handle the clean films with bare hands to feed them into the processor

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Feed the films into the processor with contaminated gloves

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Remove the films from the loader and carry them to the processor by hand

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Spray the films with disinfectant before processing

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What items from the film packet should be disposed of as contaminated waste during the unwrapping process?

The outer film packet wrapper, the black paper insert, and the lead foil backing

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The film itself

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The processing solutions

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The cassette

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Before exposing a digital radiograph, a dental assistant places a plastic sleeve over the digital sensor. What is the primary purpose of this barrier?

To prevent contamination of the sensor with saliva and blood

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To improve the quality of the radiographic image

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To reduce radiation exposure to the patient

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To protect the sensor from light exposure

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After exposing intraoral radiographs, the dental assistant discovers a tear in the sensor cover. What should be done with the sensor?

Clean and disinfect the sensor with an EPA-registered intermediate-level disinfectant

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Rinse the sensor with water and continue using it immediately

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Discard the sensor and use a new one

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Place the sensor in the autoclave for sterilization

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When using photostimulable phosphor (PSP) plates for intraoral radiography, what barrier is placed over the plate before inserting it into the patient’s mouth?

A disposable plastic barrier envelope

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A lead foil wrapper

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A cotton gauze pad

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A sterilized metal cassette

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A dental assistant is preparing to scan PSP plates after exposing a full mouth series. The barrier envelope on one plate appears intact. What is the correct procedure for opening the barrier?

Open the barrier in a dimly lit area and drop the plate onto a clean surface without touching it with contaminated gloves

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Remove the barrier under bright operatory light to check for damage before scanning

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Peel the barrier away while wearing the same gloves used during exposure

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Wipe the outside of the barrier with disinfectant, then open and handle the plate with the same gloves

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When unwrapping exposed dental film packets in the darkroom, what type of gloves should the dental assistant wear to handle the contaminated outer wrapping?

Powder-free examination gloves

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Sterile surgical gloves

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Heavy-duty utility gloves

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Latex powdered examination gloves

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A dental assistant is processing conventional radiographic films in the darkroom. After opening each contaminated film packet with gloved hands, the assistant drops the unwrapped film onto a clean paper cup. What is the purpose of the paper cup in this workflow?

To provide a clean receptacle that keeps the unwrapped film from contacting contaminated surfaces

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To collect developer solution that drips from the film during processing

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To transport the films from the operatory to the darkroom

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To dispose of contaminated film packets after unwrapping

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In the darkroom film unwrapping procedure, what defines the “contaminated side” of the work area?

The area where exposed, wrapped film packets are opened and outer wrappings are discarded

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The area where the automatic processor feeds and develops the films

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The area where processed, dry radiographs are sorted and mounted

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The area where fresh, unexposed film packets are stored

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After unwrapping all contaminated film packets and dropping the films into a clean cup, the dental assistant removes contaminated gloves. What should the assistant do before feeding the unwrapped films into the processor?

Wash hands or apply new clean gloves before handling the unwrapped films

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Pick up the films immediately since the outer wrapping has been removed

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Wipe hands on a paper towel and proceed with film processing

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Spray the unwrapped films with surface disinfectant before processing

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How should the lead foil found inside dental film packets be handled after the film is unwrapped in the darkroom?

Collected separately and recycled or disposed of according to local environmental regulations

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Placed in the regular office trash with general waste

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Rinsed with disinfectant and reused in new film packets

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Flushed down the drain with processing chemicals

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A dental assistant needs to open a film packet in the darkroom but wants to minimize contamination of the inner film. Which component of the film packet should the assistant peel back first to access the film without touching it?

The outer plastic or paper wrapping, peeling it away so the inner black paper and film drop out

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The lead foil backing, which is peeled off to expose the film directly

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The inner black paper, which is removed first to reveal the film emulsion

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The tab on the back of the packet, which pulls the film out through a slot

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A dental assistant is preparing to unwrap contaminated film packets in the darkroom but realizes that only powdered latex gloves are available. What is the most appropriate course of action?

Obtain powder-free gloves before proceeding, as glove powder can create artifacts on processed radiographs

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Use the powdered gloves and rinse the films with water after unwrapping to remove powder residue

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Unwrap the films without gloves to avoid the powder contamination issue

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Use the powdered gloves and proceed normally since powder does not affect film quality

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During radiographic procedures, a dental assistant wears treatment gloves while positioning films in the patient’s mouth. When the assistant needs to retrieve additional supplies from a drawer, what should be placed over the treatment gloves?

Overgloves to prevent contaminating the drawer and supply items

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A second pair of sterile surgical gloves over the treatment gloves

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Nothing additional, provided the assistant uses only one hand to open the drawer

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Utility gloves designed for instrument processing

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What is the correct sequence of steps for handling exposed dental film packets in the darkroom to prevent cross-contamination?

Open contaminated packets with gloved hands, drop films into a clean cup, remove gloves, wash hands, then feed films into the processor with clean hands

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Feed films into the processor with gloved hands, then discard the outer wrappings

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Remove gloves first, then open the contaminated film packets with bare hands

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Spray each film packet with disinfectant, open with bare hands, and feed directly into the processor

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What should be placed over a digital sensor before intraoral use?

A disposable FDA-cleared barrier sleeve

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A thin layer of petroleum jelly for moisture protection

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A reusable silicone cover that is sterilized between patients

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A standard plastic sandwich bag from the office kitchen

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What must be done to a phosphor storage plate (PSP) before it can be reused for the next radiographic exposure?

Erase the plate by exposing it to bright light in the PSP scanner or erasing device

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Rinse the plate under warm water and air dry it for 5 minutes

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Sterilize the plate in the autoclave between patient uses

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Reformat the plate using the imaging software before scanning

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Why is it important to check the barrier sleeve for tears or punctures before placing a digital sensor in the patient’s mouth?

A compromised barrier allows saliva and blood to contact the sensor, which cannot be sterilized by conventional methods

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A torn barrier will cause the sensor to produce a distorted image

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Moisture from a compromised barrier will permanently damage the sensor's electronic components

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A broken barrier releases chemicals from the sensor surface that are harmful to patients

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A dental assistant notices that a phosphor storage plate (PSP) has visible scratches on its imaging surface. How should this plate be handled?

Remove the scratched plate from service because scratches create artifacts that degrade image quality

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Continue using the plate since minor scratches do not affect image capture

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Buff out the scratches with a soft cloth and return the plate to service

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Use the scratched plate only for bitewing radiographs where precision is less critical

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What is the correct method for erasing a phosphor storage plate (PSP) before reuse?

Exposing the plate to a bright white light source in the PSP scanner or eraser unit

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Rinsing the plate under running water to clear the stored image

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Placing the plate in the autoclave for a brief sterilization cycle

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Storing the plate in a dark envelope for 24 hours to allow the image to fade

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When cleaning a PSP scanner, the dental assistant should follow which protocol?

Follow the manufacturer's guidelines for cleaning and disinfecting the scanner components

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Spray the scanner drum with high-level disinfectant and allow it to air dry

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Immerse all removable scanner parts in a cold sterilization solution overnight

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Wipe the scanner with a dry cloth only, since chemical cleaners damage the optics

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A dental office is experiencing frequent digital sensor failures. Staff report that sensors are cleaned by immersion in a glutaraldehyde solution after each use. What is the most likely cause of the sensor failures?

Prolonged chemical immersion is damaging the sensor's internal electronic components and cable connections

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Glutaraldehyde is not an effective disinfectant for dental radiographic equipment

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The sensors are being exposed to too many x-ray cycles per day

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Staff are failing to erase the stored images before reusing the sensors

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Which part of a digital sensor is most vulnerable to damage from improper handling?

The cable and connector at the point where it attaches to the sensor body

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The active imaging area on the front surface of the sensor

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The plastic housing on the back of the sensor

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The USB plug that connects to the computer

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A dental assistant is preparing to take radiographs on the next patient. The previous patient’s barrier-covered sensor was removed, and the barrier was discarded. What additional step must be completed before using the sensor on the next patient?

Disinfect the sensor with an appropriate surface disinfectant, then apply a new barrier sleeve

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Apply a new barrier sleeve directly without additional cleaning

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Rinse the sensor under tap water and place it in a new barrier

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Sterilize the sensor in a chemical vapor sterilizer before covering it

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How should phosphor storage plates (PSPs) be cleaned between patients?

Wiped with a disinfectant recommended by the manufacturer and placed in a clean barrier for the next patient

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Placed in an ultrasonic cleaner for 10 minutes to remove contaminants

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Sterilized in the autoclave along with other semi-critical instruments

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Rinsed under cold water and air dried on the countertop

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A dental office is transitioning from film-based radiography to digital sensors. Which infection control consideration is most important for the staff to understand about this change?

Digital sensors cannot be heat sterilized, so barrier protection and surface disinfection are the primary infection control methods

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Digital sensors eliminate the need for infection control because they do not contact the patient's mouth

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Digital sensors must be cold-sterilized in glutaraldehyde between every patient

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The transition to digital eliminates the risk of cross-contamination in the darkroom

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While removing a PSP from a patient’s mouth, the dental assistant touches the unbarriered side of the plate with a contaminated glove. What is the correct next step?

Disinfect the contaminated area of the plate, then scan the image before the latent image degrades

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Discard the plate and retake the radiograph with a new PSP

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Scan the plate immediately without cleaning to preserve the image

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Place the plate back in the barrier sleeve and scan it later with the rest of the series

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What is the primary reason digital sensors should be stored according to the manufacturer’s guidelines when not in use?

To protect the sensor from physical damage, moisture, and environmental conditions that could impair function

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To prevent the sensor from absorbing background radiation that would affect image quality

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To allow the sensor's battery to recharge between uses

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To maintain the sensor's sterility between patient appointments

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A dental assistant notices that the PSP barrier was breached during a full mouth series, potentially contaminating the scanner when the plate was fed through. What should the assistant do?

Clean and disinfect the scanner rollers and feed mechanism following manufacturer instructions before scanning additional plates

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Continue scanning the remaining plates and clean the scanner at the end of the day

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Run several blank plates through the scanner to wipe off any contamination

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Spray the scanner opening with surface disinfectant and resume scanning immediately

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What type of disinfectant must be used to wipe down radiographic equipment between patients?

An EPA-registered hospital-grade surface disinfectant

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Rubbing alcohol (70% isopropyl)

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Household bleach diluted to 1:100 ratio

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Antibacterial hand soap mixed with warm water

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Which component of the x-ray unit should be disinfected between patients if it was not covered with a barrier?

The tubehead cone, arm, and yoke

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Only the position indicator device (cone)

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Only the control panel outside the operatory

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The electrical cord and wall outlet

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A dental assistant is disinfecting the x-ray tubehead using the spray-wipe-spray technique. What is the correct sequence of steps?

Spray the surface, wipe to remove debris, then spray again and allow the disinfectant to remain wet for the recommended contact time

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Spray the surface, wait 10 minutes, then wipe dry with a paper towel

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Wipe the surface with a dry cloth, spray disinfectant, then wipe dry immediately

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Spray the surface twice consecutively, then wipe once to dry

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Which part of the panoramic x-ray unit contacts the patient’s face and requires disinfection or a barrier between each patient?

The chin rest and forehead support

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The rotating arm mechanism only

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The digital sensor housed inside the unit

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The power switch and exposure button

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A dental assistant is cleaning the panoramic unit and discovers dried saliva on the bite block guide. The bite block itself was replaced with a new disposable one. Does the guide still need disinfection?

Yes, the guide must be cleaned and disinfected because it contacted the previous patient's saliva

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No, the guide does not need disinfection since a new bite block will cover it

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No, the guide is protected by the disposable bite block and does not contact the patient

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Only if the previous patient had a known infectious disease

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The headrest on the dental chair is adjusted during radiographic positioning. How should it be managed for infection control?

Cover with a barrier before the patient is seated, or disinfect between patients

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Disinfect only at the end of the day since it contacts the patient's hair, not saliva

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Replace the entire headrest cover weekly as part of routine maintenance

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Wipe with a dry paper towel between patients to remove debris

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A dental assistant notices that the disinfectant used in the radiology area has expired. The office has unexpired disinfectant wipes available from a different manufacturer. What is the appropriate action?

Discard the expired disinfectant and use the unexpired product, verifying it is EPA-registered for surface disinfection

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Continue using the expired disinfectant since it is the same chemical formulation

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Mix the expired disinfectant with fresh product to extend its effectiveness

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Use plain water to wipe surfaces until the correct disinfectant can be reordered

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After taking radiographs, the dental assistant touched the x-ray unit’s arm and yoke with contaminated gloves but had placed barriers on the cone and exposure button. Which surfaces need disinfection?

The arm and yoke, since they were touched without barriers in place

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Only the cone and exposure button, since those are the primary contact points

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The entire x-ray unit from the wall mount to the cone

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Only the surfaces the patient physically touched during the procedure

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What is the primary purpose of using plastic barriers on radiographic equipment rather than relying solely on disinfection?

Barriers prevent contamination of surfaces that are difficult to disinfect effectively

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Barriers are less expensive than purchasing disinfectant products

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Barriers eliminate the need for wearing gloves during radiographic procedures

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Barriers provide a sterile field required by OSHA for all radiographic equipment

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A dental assistant is disinfecting the chin rest on the panoramic unit using an EPA-registered disinfectant spray. The manufacturer label states a 2-minute contact time. After spraying, the assistant wipes the surface dry after 30 seconds. Is this acceptable?

No, the surface must remain wet with disinfectant for the full 2-minute contact time

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Yes, 30 seconds is sufficient because panoramic chin rests are low-risk surfaces

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Yes, the disinfectant kills microorganisms on contact regardless of drying time

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No, the contact time should be doubled to 4 minutes for surfaces that contact mucous membranes

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A dental office uses disposable bite blocks for panoramic radiographs. The dental assistant replaces the bite block between patients but does not disinfect the metal post that holds the bite block. A colleague questions this practice. Who is correct?

The colleague is correct; the metal post must also be disinfected because it can become contaminated with saliva

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The dental assistant is correct; the disposable bite block prevents contamination of the post

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The colleague is correct, but only if the previous patient had visible oral lesions

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The dental assistant is correct because the metal post is self-disinfecting due to its metallic surface

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What type of barrier is placed over a phosphor storage plate (PSP) before use in intraoral radiography?

An FDA-cleared disposable plastic sleeve

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A reusable cloth cover autoclaved between patients

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A layer of disinfectant spray applied directly to the plate surface

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An aluminum foil wrapper sealed with tape

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During a full mouth series, a dental assistant notices a small tear in the barrier sleeve covering a phosphor plate after removing it from the patient’s mouth. What is the appropriate next step?

Discard the contaminated sleeve, disinfect the plate according to manufacturer instructions, and resheath it before the next exposure

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Continue using the plate because the tear is small and unlikely to cause contamination

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Wipe the plate with a dry paper towel and place it in a new sleeve for the next exposure

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Discard the phosphor plate entirely and replace it with a new one

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Which component of the x-ray unit should be covered with a barrier before taking radiographs?

The tube head and position indicating device (PID)

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The timer display panel only

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The x-ray unit base and support arm only

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The wall-mounted control box only

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A dental assistant is setting up for a patient who requires periapical radiographs using a digital sensor. Which barrier protocol is correct for the sensor?

Place an FDA-cleared barrier sheath over the sensor and secure it before positioning in the patient's mouth

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Spray the sensor with intermediate-level disinfectant and allow it to dry before placing it in the mouth

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Wrap the sensor cord in a paper towel and insert the unsheathed sensor into the mouth

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Immerse the sensor in a cold sterilization solution for 10 minutes before use

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Why is the exposure button or switch covered with a barrier during radiographic procedures?

To prevent contamination from gloved hands that have contacted the patient's oral cavity

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To protect the button from damage caused by disinfectant chemicals

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To reduce electrical hazards associated with the exposure switch

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To prevent accidental exposures by making the button harder to press

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A dental office is evaluating whether to use single barriers or double barriers on their digital sensors. Under what circumstance would using a double barrier be most appropriate?

When the sensor design has edges or contours that increase the risk of a single barrier tearing during placement

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When the patient is classified as a standard risk with no known infectious disease

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When the office uses rectangular collimation instead of round collimation

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When the manufacturer has labeled the sensor as fully waterproof

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When using conventional film packets for intraoral radiography, what barrier method protects the film from contamination?

A plastic barrier envelope that encloses the entire film packet

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A coat of varnish applied to the outer surface of the film packet

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A latex finger cot placed over the film packet

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A disinfectant wipe rubbed across the packet before insertion

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A dental assistant has finished exposing all radiographs for a patient and is ready to remove barriers from the x-ray equipment. What is the proper sequence?

Remove contaminated gloves, perform hand hygiene, don clean gloves, then remove and discard barriers from equipment surfaces

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Remove barriers with contaminated gloves, spray surfaces with disinfectant, then remove gloves and wash hands

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Remove gloves, remove barriers with bare hands, then perform hand hygiene

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Leave barriers in place until the next patient and add a fresh layer of barriers on top

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Which regulatory agency clears barrier products used on intraoral radiographic sensors and PSP plates?

The U.S. Food and Drug Administration (FDA)

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The Occupational Safety and Health Administration (OSHA)

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The Centers for Disease Control and Prevention (CDC)

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The American Dental Association (ADA)

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A dental assistant is preparing the dental chair for radiographic imaging. Which items should receive barrier coverage before the patient is seated?

The headrest, chair controls, and any surfaces that may be contacted during the procedure

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Only the headrest, because other chair surfaces are not touched during radiography

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Only the chair back and seat cushion, because those are the primary patient contact areas

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No chair surfaces require barriers because the chair is disinfected between patients instead

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An office manager asks whether using barriers on radiographic equipment eliminates the need for surface disinfection between patients. Which response is most accurate?

Barriers reduce the need for disinfection on covered surfaces, but any surface where the barrier was compromised or not placed still requires disinfection

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Barriers completely eliminate the need for any surface disinfection of radiographic equipment

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Surface disinfection must always be performed on every surface regardless of whether barriers were used

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Barriers are only recommended when disinfectant chemicals are not available in the office

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What is the primary purpose of using plastic barriers on intraoral imaging devices during radiographic procedures?

To prevent contact between the imaging device and the patient's saliva and blood

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To improve the quality of the radiographic image by reducing scatter radiation

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To protect the patient from unnecessary radiation exposure during imaging

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To prevent static electricity from damaging the digital sensor circuitry

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What is the most important consideration in sensor care for digital radiography sensors between patients?

Protecting the sensor with a barrier during use and disinfecting it with an EPA-registered intermediate-level disinfectant after removing the barrier

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Submerging the sensor in a cold sterilization solution for 30 minutes between patients

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Wiping the sensor with alcohol and allowing it to air dry for 10 minutes

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Placing the sensor in the autoclave with other semicritical instruments

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After removing the barrier from a digital radiography sensor, a dental assistant performs sensor disinfection. Which level of disinfectant is appropriate for this purpose?

An EPA-registered intermediate-level disinfectant

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A high-level disinfectant requiring 6 hours of immersion

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A low-level disinfectant designed for general housekeeping surfaces

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A sterilant solution used for surgical instruments

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A dental assistant notices that the barrier on a digital sensor has a small tear after removing it from a patient’s mouth. The assistant should assume the sensor is contaminated. What is the correct next step for managing this damaged sensor situation?

Disinfect the sensor thoroughly with an intermediate-level disinfectant, paying extra attention to any areas that may have contacted oral fluids

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Rinse the sensor briefly under tap water and place a new barrier for the next patient

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Discard the sensor because it cannot be adequately decontaminated after barrier failure

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Place the sensor in the autoclave for one sterilization cycle before reuse

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What is the recommended procedure for plate cleaning of a phosphor storage plate (PSP) used in dental radiography?

Gently wipe the plate with a soft, lint-free cloth and a manufacturer-approved cleaning solution

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Scrub the plate with an abrasive sponge to remove any residual saliva

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Immerse the plate in an ultrasonic cleaner for 10 minutes

Correct Incorrect Correct answer

Rinse the plate under running water and dry it with compressed air

Correct Incorrect Correct answer

A dental assistant has finished scanning a phosphor storage plate and needs to prepare it for the next use. What must be done before reusing the plate by erasing the PSP?

Expose the plate to bright light or use the scanner's erase function to clear the stored image before placing it in a clean barrier

Correct Incorrect Correct answer

Soak the plate in a glutaraldehyde solution for 20 minutes to sterilize it

Correct Incorrect Correct answer

Place the plate in the autoclave with the instrument cassettes

Correct Incorrect Correct answer

Store the plate in a dark envelope for at least one hour to reset the phosphor layer

Correct Incorrect Correct answer

How should a dental assistant protect the sensor cable of a digital radiography sensor during patient use?

Cover the sensor cable with a barrier sleeve to prevent contamination from oral fluids and aerosols

Correct Incorrect Correct answer

Wrap the cable tightly around the x-ray tube head to keep it out of the patient's mouth

Correct Incorrect Correct answer

Coat the cable with petroleum jelly to create a moisture-resistant seal

Correct Incorrect Correct answer

Secure the cable to the dental chair arm with adhesive tape to prevent movement

Correct Incorrect Correct answer

A dental assistant is responsible for connector protection of the USB connector where the digital sensor cable plugs into the computer. What is the recommended infection control practice?

Ensure the connector area is covered or protected from splatter and handle it only with clean, uncontaminated hands or gloves

Correct Incorrect Correct answer

Spray the USB port directly with disinfectant after each patient use

Correct Incorrect Correct answer

Disconnect and autoclave the USB connector after each patient

Correct Incorrect Correct answer

Replace the USB connector weekly regardless of contamination status

Correct Incorrect Correct answer

A dental office uses both digital sensors and phosphor storage plates. The office manager asks the dental assistant to develop a protocol for cross-contamination prevention during digital radiography. Which practice is most critical to include?

Using FDA-cleared barriers on all sensors and PSPs for every patient, with proper removal technique to avoid contaminating the device underneath

Correct Incorrect Correct answer

Assigning one specific sensor to each treatment room so sensors are never shared between operatories

Correct Incorrect Correct answer

Soaking sensors and PSPs in cold sterilization solution at the end of each workday

Correct Incorrect Correct answer

Using a dedicated pair of gloves only for handling radiographic equipment

Correct Incorrect Correct answer

Which of the following best describes the correct handling protocol for a digital radiography sensor after patient use?

Remove the barrier carefully without touching the sensor surface, then wipe the sensor with an intermediate-level disinfectant

Correct Incorrect Correct answer

Remove the barrier and immediately place the sensor in a new barrier without disinfecting

Correct Incorrect Correct answer

Remove the barrier and rinse the sensor under hot running water for 30 seconds

Correct Incorrect Correct answer

Remove the barrier and place the sensor directly into the ultrasonic cleaner

Correct Incorrect Correct answer

A dental assistant is using conventional film and transports exposed films from the operatory to the darkroom in a paper cup. What is the purpose of using a paper cup transport method?

To contain the contaminated films during transport and prevent cross-contamination of surfaces between the operatory and the darkroom

Correct Incorrect Correct answer

To protect the film from light exposure that would fog the image before processing

Correct Incorrect Correct answer

To keep the films organized in the order they were exposed for proper mounting

Correct Incorrect Correct answer

To cushion the film packets and prevent physical damage during transport

Correct Incorrect Correct answer

In the darkroom, a dental assistant must open contaminated film packets and feed the film into the processor. Which film handling technique minimizes the risk of contaminating the processor and darkroom surfaces?

Open each packet with contaminated gloves, drop the film onto a clean surface or into a clean cup without touching it, remove the contaminated gloves, then feed the films into the processor with clean hands

Correct Incorrect Correct answer

Open all packets with bare hands and insert the films directly into the processor feed slot

Correct Incorrect Correct answer

Spray each film packet with surface disinfectant before opening it in the darkroom

Correct Incorrect Correct answer

Place all unopened packets directly into the processor input tray and allow the machine to open them automatically

Correct Incorrect Correct answer

When opening an exposed film packet in the darkroom, what is the correct method of lead foil disposal?

Collect the lead foil separately for recycling as it is considered environmentally hazardous waste

Correct Incorrect Correct answer

Discard the lead foil in the regular trash with other office waste

Correct Incorrect Correct answer

Flush the lead foil down the drain with processing chemicals

Correct Incorrect Correct answer

Place the lead foil in the sharps container with used needles

Correct Incorrect Correct answer

After removing the outer wrapping of a contaminated film packet, the dental assistant must handle the inner packet carefully. What is the purpose of this precaution?

To prevent the uncontaminated inner packet and film from becoming cross-contaminated

Correct Incorrect Correct answer

To avoid exposing the film to light, which would cause fogging

Correct Incorrect Correct answer

To prevent damage to the lead foil backing inside the packet

Correct Incorrect Correct answer

To keep the film dry until it is placed in the automatic processor

Correct Incorrect Correct answer

A dental assistant is processing contaminated film packets in the darkroom. Which opening technique minimizes the risk of cross-contamination?

Tearing the outer packet tab with gloved hands and dropping the film onto a clean surface without touching it

Correct Incorrect Correct answer

Using bare hands to open the packet quickly and place the film in the processor

Correct Incorrect Correct answer

Cutting the packet open with scissors and pulling the film out with the same gloves

Correct Incorrect Correct answer

Soaking the entire sealed packet in disinfectant before opening

Correct Incorrect Correct answer

Why is counter disinfection in the darkroom performed before processing exposed film?

To create a clean zone where uncontaminated films can be placed without risk of cross-contamination

Correct Incorrect Correct answer

To eliminate light leaks that could fog the film during processing

Correct Incorrect Correct answer

To neutralize processing chemicals that may have spilled on the surface

Correct Incorrect Correct answer

To prepare the counter for mixing fresh developer and fixer solutions

Correct Incorrect Correct answer

During darkroom film processing, a dental assistant has opened all contaminated film packets with gloved hands. What should the assistant do before handling the clean films for processing?

Perform a glove change to put on fresh, uncontaminated gloves

Correct Incorrect Correct answer

Continue with the same gloves since the films have already been removed from the packets

Correct Incorrect Correct answer

Remove gloves entirely and handle the films with bare hands

Correct Incorrect Correct answer

Rinse the current gloves under running water to remove surface contamination

Correct Incorrect Correct answer

A dental office uses the two-cup method for handling contaminated film packets. Which description correctly explains this technique?

Contaminated packets are placed in one cup, and clean films are dropped into a second cup after removing the outer wrapper

Correct Incorrect Correct answer

Two cups of disinfectant solution are used to soak the film packets before opening

Correct Incorrect Correct answer

One cup holds the developer solution and one cup holds the fixer for manual processing

Correct Incorrect Correct answer

Films are placed in two separate cups to sort them by anatomical region

Correct Incorrect Correct answer

What is the purpose of placing a PSP plate barrier over a phosphor storage plate before intraoral radiographic exposure?

To prevent saliva and blood contamination of the phosphor plate surface

Correct Incorrect Correct answer

To enhance image resolution by filtering scatter radiation

Correct Incorrect Correct answer

To reduce the radiation dose required for each exposure

Correct Incorrect Correct answer

To protect the phosphor plate from light exposure during transport

Correct Incorrect Correct answer

A dental assistant is preparing to take a full mouth series using phosphor plates. How should the phosphor plate sleeve be handled after exposure and removal from the patient’s mouth?

Wipe the outside of the sleeve with a disinfectant before carefully removing the plate for scanning

Correct Incorrect Correct answer

Remove the plate from the sleeve immediately without disinfecting the exterior

Correct Incorrect Correct answer

Place the entire sleeve with the plate directly into the scanner without decontamination

Correct Incorrect Correct answer

Submerge the sleeved plate in a cold sterilization solution for 10 minutes

Correct Incorrect Correct answer

When using conventional film for intraoral radiographs, what type of film barrier is placed over the film packet?

A clear plastic envelope or pouch that fully encloses the film packet

Correct Incorrect Correct answer

A lead foil wrapper placed on the tube side of the packet

Correct Incorrect Correct answer

A paper sleeve that covers only the front surface of the film

Correct Incorrect Correct answer

An adhesive strip applied directly to the outer film packet wrapping

Correct Incorrect Correct answer

Why is a tube head cover placed on the x-ray tube head between patients?

To provide a barrier that prevents contamination of the tube head from gloved hands

Correct Incorrect Correct answer

To reduce the amount of scatter radiation emitted during exposure

Correct Incorrect Correct answer

To filter out low-energy x-ray photons before they reach the patient

Correct Incorrect Correct answer

To keep the tube head at a consistent operating temperature

Correct Incorrect Correct answer

During a radiographic series, the dental assistant needs to adjust the PID (position indicating device). Which infection control step should have been completed before positioning began?

A PID cover or barrier should have been placed over the cone before the procedure started

Correct Incorrect Correct answer

The PID should have been autoclaved between each exposure in the series

Correct Incorrect Correct answer

The dental assistant should remove gloves before touching the PID

Correct Incorrect Correct answer

The PID should be submerged in glutaraldehyde solution before use

Correct Incorrect Correct answer

What is the recommended barrier for the exposure button used during dental radiography?

An exposure button cover made of clear plastic that is replaced between patients

Correct Incorrect Correct answer

A reusable fabric cover that is laundered at the end of each day

Correct Incorrect Correct answer

A layer of aluminum foil wrapped around the button before each exposure

Correct Incorrect Correct answer

No barrier is needed because the operator stands behind a wall during exposure

Correct Incorrect Correct answer

Before seating a patient for dental radiographs, the dental assistant places a chair cover over the headrest and armrests. What is the primary reason for this step?

To provide a barrier that prevents the chair surfaces from becoming contaminated during the procedure

Correct Incorrect Correct answer

To provide additional comfort and cushioning for the patient

Correct Incorrect Correct answer

To protect the chair upholstery from staining by developer chemicals

Correct Incorrect Correct answer

To absorb excess saliva that may drip during film placement

Correct Incorrect Correct answer

A dental assistant is using a digital sensor for periapical radiographs. The sensor cannot be heat sterilized. Which method provides the best digital sensor protection against cross-contamination?

Placing an FDA cleared barrier sheath over the sensor before each patient use

Correct Incorrect Correct answer

Wiping the sensor with an alcohol pad between patients without a barrier

Correct Incorrect Correct answer

Rinsing the sensor under running water after removing it from the patient's mouth

Correct Incorrect Correct answer

Wrapping the sensor in gauze secured with tape before placement

Correct Incorrect Correct answer

During a radiographic procedure, the dental assistant notices that the barrier on a phosphor plate has a small tear after removing it from the patient’s mouth. This represents a barrier failure. What should the dental assistant do?

Discard the contaminated plate, disinfect a replacement plate, apply a new barrier, and retake the image

Correct Incorrect Correct answer

Scan the plate immediately since the image has already been captured

Correct Incorrect Correct answer

Wipe the plate surface with a paper towel and proceed with scanning

Correct Incorrect Correct answer

Place additional tape over the torn area and continue with the next exposure

Correct Incorrect Correct answer

Why must barriers used on digital sensors and phosphor plates during intraoral radiography be FDA cleared?

Because the FDA regulates barriers as medical devices to ensure they provide adequate protection against fluid penetration

Correct Incorrect Correct answer

Because FDA clearance guarantees the barrier will improve image quality

Correct Incorrect Correct answer

Because only FDA cleared barriers are compatible with digital imaging software

Correct Incorrect Correct answer

Because non-cleared barriers emit chemicals that interfere with x-ray exposure

Correct Incorrect Correct answer

A dental assistant is taking radiographs using the clean technique protocol. Which step describes the correct approach when using this method?

Overglove or remove contaminated gloves and don clean gloves before touching the exposure control panel

Correct Incorrect Correct answer

Use the same gloves to position the sensor in the mouth and operate the exposure button

Correct Incorrect Correct answer

Have another staff member operate the exposure switch while the assistant holds the sensor in the patient's mouth

Correct Incorrect Correct answer

Disinfect gloves with hand sanitizer between placing the sensor and pressing the exposure button

Correct Incorrect Correct answer

After each patient, which level of disinfection is recommended for clinical contact surfaces on the x-ray unit that were not covered with barriers?

Intermediate-level disinfection with an EPA-registered hospital disinfectant with tuberculocidal claim

Correct Incorrect Correct answer

Low-level disinfection with a household cleaner

Correct Incorrect Correct answer

Sterilization using an autoclave

Correct Incorrect Correct answer

High-level disinfection with glutaraldehyde immersion

Correct Incorrect Correct answer

Why must disinfectants used on dental radiographic equipment surfaces be registered with the Environmental Protection Agency (EPA)?

EPA registration ensures the product has been tested and proven effective against specific pathogens

Correct Incorrect Correct answer

EPA registration means the product is safe to use on electronic equipment

Correct Incorrect Correct answer

EPA registration guarantees the product will not damage plastic surfaces

Correct Incorrect Correct answer

EPA registration indicates the product is available for purchase without a license

Correct Incorrect Correct answer

When preparing a panoramic x-ray unit for the next patient, the dental assistant notices that no barrier was placed on the chin support during the previous exposure. What should the assistant do?

Clean the chin support first, then disinfect it with an intermediate-level disinfectant before placing a new barrier

Correct Incorrect Correct answer

Simply place a new barrier over the chin support without cleaning

Correct Incorrect Correct answer

Wipe the chin support with a dry paper towel and proceed

Correct Incorrect Correct answer

Sterilize the chin support in the autoclave before the next patient

Correct Incorrect Correct answer

What must be done to a phosphor storage plate (PSP) before it can be reused for the next patient exposure?

The plate must be erased by running it through the scanner's erase cycle or exposing it to bright light to clear the stored image

Correct Incorrect Correct answer

The plate must be autoclaved between patients

Correct Incorrect Correct answer

The plate must be soaked in a chemical sterilant for 10 minutes

Correct Incorrect Correct answer

No additional steps are needed once the image has been scanned

Correct Incorrect Correct answer

Before reusing a phosphor storage plate for the next patient, what step is required to clear any residual image from the plate?

Erasing the PSP by running it through the scanner's erasing cycle or exposing it to bright ambient light

Correct Incorrect Correct answer

Wiping the plate surface with alcohol and allowing it to air dry

Correct Incorrect Correct answer

Storing the plate in a dark envelope for at least 24 hours

Correct Incorrect Correct answer

Rinsing the plate under running water to remove any latent image chemicals

Correct Incorrect Correct answer

After completing a series of intraoral radiographs, the dental assistant must disinfect the radiographic equipment. Which surfaces require disinfection between patients?

All clinical contact surfaces including the tubehead, PID, exposure button, and positioning arm

Correct Incorrect Correct answer

Only the exposure button since it is the only surface the assistant touches with contaminated gloves

Correct Incorrect Correct answer

Only the tubehead and PID because they are closest to the patient during exposure

Correct Incorrect Correct answer

No surfaces need disinfection if barriers were placed before the procedure

Correct Incorrect Correct answer

A dental assistant is training a new employee on infection control for the radiology area. The new employee asks whether disinfection is necessary if plastic barriers were used on all surfaces. What is the correct response?

Barriers reduce contamination, but surfaces should still be inspected and any areas where barriers were compromised must be disinfected

Correct Incorrect Correct answer

Barriers eliminate the need for any surface disinfection between patients

Correct Incorrect Correct answer

Disinfection is only needed for the exposure button because it is touched most frequently

Correct Incorrect Correct answer

Surfaces under barriers never become contaminated so no further cleaning is required

Correct Incorrect Correct answer

After scanning a phosphor storage plate, the dental assistant notices a faint ghost image from a previous exposure on the new scan. What step was likely skipped?

The plate was not properly erased; erasing PSP plates between uses removes residual latent images

Correct Incorrect Correct answer

The plate was exposed to too much radiation during the current patient's radiograph

Correct Incorrect Correct answer

The scanner software failed to process the new image correctly

Correct Incorrect Correct answer

The plate barrier was contaminated, causing image artifacts on the scan

Correct Incorrect Correct answer

After taking a panoramic radiograph, the dental assistant needs to prepare the machine for the next patient. Which surfaces of the panoramic unit require disinfection?

The chin rest, bite block guide, head positioning supports, and any surfaces contacted by the patient or operator's contaminated gloves

Correct Incorrect Correct answer

Only the bite block, since it is the only component that contacts the patient's mouth

Correct Incorrect Correct answer

Only surfaces that have visible contamination such as saliva or blood

Correct Incorrect Correct answer

No surfaces need disinfection because panoramic machines do not contact the intraoral environment

Correct Incorrect Correct answer

What level of disinfectant is recommended for cleaning the x-ray tubehead, PID, and exposure button between patients?

An EPA-registered, intermediate-level (hospital-grade, tuberculocidal) disinfectant

Correct Incorrect Correct answer

A low-level disinfectant designed for housekeeping surfaces only

Correct Incorrect Correct answer

A high-level disinfectant such as glutaraldehyde used for sterilizing instruments

Correct Incorrect Correct answer

Isopropyl alcohol wipes without EPA registration for radiographic equipment

Correct Incorrect Correct answer

During a full-mouth radiographic series, a dental assistant notices that the plastic barrier on the PID has torn. What is the correct action?

Stop, disinfect the exposed PID surface with an intermediate-level disinfectant, and apply a fresh barrier before continuing

Correct Incorrect Correct answer

Continue the series and disinfect the PID only after all exposures are completed

Correct Incorrect Correct answer

Replace the torn barrier without disinfecting since the surface underneath was covered initially

Correct Incorrect Correct answer

Wipe the PID with a dry paper towel and continue with the remaining exposures

Correct Incorrect Correct answer

Which items in the radiology operatory should have disposable plastic barriers placed on them before patient treatment?

The tubehead, PID, exposure button, chair headrest, and any surfaces that will be touched during the procedure

Correct Incorrect Correct answer

Only the digital sensor, since it is the only item that enters the patient's mouth

Correct Incorrect Correct answer

Only the exposure button and the chair armrests

Correct Incorrect Correct answer

Barriers are optional if the surfaces are disinfected after each patient

Correct Incorrect Correct answer

A dental assistant drops a PSP plate on the floor during a radiographic procedure. What is the appropriate course of action?

Disinfect the plate with an intermediate-level disinfectant, place it in a new barrier sleeve, and inspect for damage before reuse

Correct Incorrect Correct answer

Discard the plate immediately since floor contact makes it permanently contaminated

Correct Incorrect Correct answer

Rinse the plate under tap water and place it in a fresh barrier sleeve without further disinfection

Correct Incorrect Correct answer

Use the plate without additional steps since it was already inside a barrier sleeve

Correct Incorrect Correct answer

How should digital sensors be stored when not in use to protect them from damage?

In a clean, dry, padded storage container with the cable loosely coiled to prevent bending or crimping

Correct Incorrect Correct answer

Hanging from the cable on a hook attached to the wall of the operatory

Correct Incorrect Correct answer

Submerged in disinfectant solution inside a covered container

Correct Incorrect Correct answer

Stacked on top of each other in a drawer without protective padding

Correct Incorrect Correct answer

A dental assistant is using the daylight loader on an automatic film processor. After opening contaminated film packets with gloved hands, what must happen before feeding the film into the processor?

Remove contaminated gloves, wash hands or use overgloves, and handle the unwrapped film with clean hands or fresh gloves to prevent contaminating the processor rollers

Correct Incorrect Correct answer

Feed the film directly into the processor with the same gloves since the processor chemicals will disinfect it

Correct Incorrect Correct answer

Rinse the unwrapped film under running water before feeding it into the processor

Correct Incorrect Correct answer

Spray the film with disinfectant before placing it in the processor feed slot

Correct Incorrect Correct answer

When transporting exposed film packets from the operatory to the darkroom, what container method helps maintain infection control?

Place the contaminated packets in a disposable paper cup or transport container designated for contaminated films

Correct Incorrect Correct answer

Carry the packets in the assistant's lab coat pocket for convenience

Correct Incorrect Correct answer

Hold the packets in a bare hand and walk them directly to the darkroom

Correct Incorrect Correct answer

Place the packets in a sterilization pouch before transporting them

Correct Incorrect Correct answer

What type of gloves should the dental assistant wear when exposing intraoral radiographs?

Non-sterile examination gloves, changed for each patient

Correct Incorrect Correct answer

Sterile surgical gloves required for all intraoral procedures

Correct Incorrect Correct answer

Heavy-duty utility gloves designed for instrument processing

Correct Incorrect Correct answer

No gloves are required since the sensor barrier prevents contamination

Correct Incorrect Correct answer

The dental assistant is cleaning the panoramic machine between patients. The chin rest has a dried film of saliva. What disinfection procedure should be followed?

Clean the chin rest to remove the visible debris first, then apply an intermediate-level disinfectant and allow the full contact time

Correct Incorrect Correct answer

Apply disinfectant directly over the dried saliva without pre-cleaning since the chemical will dissolve it

Correct Incorrect Correct answer

Wipe with a dry paper towel only, since the saliva is dried and no longer infectious

Correct Incorrect Correct answer

Replace the chin rest with a new one after every patient who leaves visible saliva

Correct Incorrect Correct answer

What happens to the lead foil from inside a dental film packet after the film is removed for processing?

The lead foil is collected and disposed of according to local regulations for lead waste; it is not placed in regular trash

Correct Incorrect Correct answer

The lead foil is processed through the automatic processor along with the film

Correct Incorrect Correct answer

The lead foil is returned to the patient as a memento of their visit

Correct Incorrect Correct answer

The lead foil is placed in the biohazard waste bag with other contaminated materials

Correct Incorrect Correct answer

What should the dental assistant inspect before placing a barrier sleeve over a digital sensor?

Check the barrier for tears, holes, or defects that could allow contamination to reach the sensor during use

Correct Incorrect Correct answer

Verify the barrier has an expiration date printed on it before use

Correct Incorrect Correct answer

Ensure the barrier is opaque to prevent light from affecting the sensor

Correct Incorrect Correct answer

Confirm the barrier is large enough to cover both the sensor and the cable completely

Correct Incorrect Correct answer

A dental assistant places a plastic barrier over the exposure button before radiographic procedures. After multiple exposures, the assistant notices saliva on the gloves. What is the correct protocol when pressing the exposure button with contaminated gloves?

Use overgloves over the contaminated examination gloves or remove gloves and use a clean hand to press the exposure button

Correct Incorrect Correct answer

Press the exposure button with contaminated gloves since the barrier covers the button

Correct Incorrect Correct answer

Clean the contaminated gloves with an alcohol wipe and then press the button

Correct Incorrect Correct answer

Ask the patient to press the exposure button to avoid cross-contamination

Correct Incorrect Correct answer

A dental assistant uses the two-cup method for handling contaminated film packets in the darkroom. What does this method involve?

One cup holds the contaminated packets; the assistant opens each packet, drops the film into a second clean cup, then processes the films from the clean cup

Correct Incorrect Correct answer

Both cups contain disinfectant solution for soaking the film before processing

Correct Incorrect Correct answer

One cup is for developer solution and the other for fixer solution in manual processing

Correct Incorrect Correct answer

Two cups are used to rinse the film before and after automatic processing

Correct Incorrect Correct answer

How should the bite block on a panoramic machine be handled for infection control?

Use a disposable bite block cover or replace the bite block between patients, and disinfect the bite block guide and surrounding surfaces

Correct Incorrect Correct answer

Rinse the bite block with water between patients since it only contacts the teeth

Correct Incorrect Correct answer

Sterilize the bite block in the autoclave between every patient

Correct Incorrect Correct answer

No special handling is needed because the bite block does not contact saliva

Correct Incorrect Correct answer

What is the primary purpose of placing a barrier sleeve over a digital sensor before intraoral use?

To prevent contamination of the sensor surface with saliva, blood, and microorganisms during intraoral placement

Correct Incorrect Correct answer

To increase the size of the sensor for better coverage of the tooth anatomy

Correct Incorrect Correct answer

To improve image quality by filtering scatter radiation before it reaches the sensor

Correct Incorrect Correct answer

To protect the sensor from damage caused by the patient biting on it

Correct Incorrect Correct answer

DANB CDA – RHS: Infection Prevention and Control — All Questions

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