DANB CDA – GC: Dental Materials — All Questions

What are the main components of dental amalgam?

The dentist asks the dental assistant to prepare composite material for a posterior restoration. Which type of composite is most appropriate?

What is the function of the bonding agent (adhesive) used with composite restorations?

Which impression material is considered the most accurate for crown and bridge final impressions?

The dental assistant is mixing alginate impression material and notices it is setting faster than expected. Which factor most likely caused the rapid set?

What type of impression tray is custom-made from a diagnostic model for a specific patient?

What is the difference between a liner and a base in restorative dentistry?

The dentist plans to cement a ceramic crown. Which cement should be avoided because it may discolor the translucent restoration?

What is the purpose of a temporary (provisional) restoration?

A patient calls to report that the temporary crown placed yesterday has come off. What should the dental assistant advise?

Which material is commonly used to fabricate a chairside temporary crown?

Which type of gypsum product has the highest compressive strength and is used when maximum accuracy and expansion control are required for die fabrication?

What type of wax is used to record the patient’s bite relationship (occlusal registration)?

When mixing dental stone for a study model, the dental assistant notices the mix is too thin and watery. What is the most likely cause?

What document provides information about the hazards, safe handling, and emergency procedures for a dental material?

A dental assistant accidentally spills a small amount of liquid mercury from an amalgam capsule on the countertop. What is the correct action?

What personal protective equipment should a dental assistant wear when mixing acrylic resin for a temporary crown?

Which type of dental cement is known for its sedative effect on the pulp?

Polycarboxylate cement bonds to tooth structure through which mechanism?

A dentist asks you to prepare a cement for permanent cementation of a porcelain crown. The cement should bond to both the restoration and the tooth without a separate etching step. Which cement type should you select?

What is the primary purpose of applying cavity varnish to a prepared tooth?

A patient reports sensitivity to cold after receiving a composite restoration one week ago. The dentist suspects a gap at the tooth-restoration interface. Which product would have been most effective at preventing this issue during the initial placement?

What is the function of a dentin bonding agent in restorative dentistry?

What is the purpose of applying an etchant (phosphoric acid) to enamel before placing a composite restoration?

During a composite restoration, the dentist has etched and rinsed the tooth. You are asked to hand the next material in the bonding sequence. Which product should you pass?

In a bonding system, what is the role of the adhesive (bonding resin)?

A dental practice uses a total-etch bonding system for composite restorations. The dentist is considering switching to a self-etch system for certain procedures. What is a key advantage of the self-etch approach?

The dentist wants to bond a composite restoration to a tooth that has both enamel and dentin surfaces exposed. She asks you to set up for selective etch technique. Which surfaces will receive phosphoric acid?

Which term describes the process of using cement to attach an indirect restoration, such as a crown, to a prepared tooth?

A patient returns to the office because a temporary crown has come off two days after placement. Which type of cement was most likely used to seat the temporary crown?

The dentist is selecting a permanent cement for a metal crown on a tooth with a deep preparation close to the pulp. The dentist wants a cement that provides fluoride release and chemical bonding. Which cement best meets these requirements?

Which property of a dental cement describes its ability to be tolerated by living tissues without causing harm?

The dentist places a total-etch bonding system and instructs you to time the etch application. For how long is phosphoric acid typically left on enamel before rinsing?

Why should eugenol-containing cements be avoided under composite resin restorations?

Which impression material is commonly known as alginate?

Agar impression material is classified as which type of hydrocolloid?

The dentist needs an extremely accurate final impression for a fixed bridge. Which elastomeric impression material offers the best dimensional stability over time?

Which characteristic distinguishes polysulfide impression material from other elastomeric materials?

A dental assistant notices that condensation silicone impressions taken at the office frequently distort before the laboratory can pour them. What is the most likely cause?

Which category of impression materials includes polyvinyl siloxane, polyether, and polysulfide?

While mixing alginate, the dental assistant notices the material is setting faster than expected. What is the most likely cause?

Which property of an impression material describes its ability to maintain its size and shape after removal from the mouth?

When removing an impression of a quadrant with a fixed bridge, the dental assistant notices the impression material has torn in the interproximal area. Which material property was insufficient?

An impression material that attracts water and can accurately capture detail in a moist environment is described as which of the following?

A dental assistant is preparing to take an alginate impression and notices the material has not been fluffed before dispensing. Why is it important to fluff alginate powder before measuring?

What type of mixing system dispenses two impression material pastes simultaneously through a single tip?

The dentist asks you to hand mix polysulfide impression material on a paper pad. What technique should be used to minimize air incorporation during mixing?

During a crown and bridge impression, the dentist loads a syringe with impression material before injecting it around the prepared tooth. What viscosity of material is typically used in the syringe?

Which viscosity of elastomeric impression material is used in the tray to provide bulk and rigidity?

Putty impression material is most commonly used in which impression technique?

The office is deciding between polyvinyl siloxane (PVS) and polyether for final impressions. A dental assistant notes that many patients have heavy saliva flow. Which material property should most influence this decision?

An alginate impression was left on the countertop for 30 minutes before the dental assistant attempted to pour it. The resulting model shows significant distortion. What phenomenon most likely caused this?

A material that repels water and may produce voids when used in a moist environment is described as which of the following?

Which type of prefabricated temporary crown is a thin metal shell that is trimmed, contoured, and filled with temporary material to cover a prepared tooth?

What is the primary advantage of using a polycarbonate crown as a temporary restoration for an anterior tooth?

A dentist has prepared a primary molar on a pediatric patient for a full coverage restoration that will remain in place until the tooth is naturally exfoliated. Which crown type is most appropriate?

Which cement is commonly used to lute a temporary crown and contains eugenol, which has a sedative effect on the dental pulp?

A patient will receive a composite resin final restoration. Why would the dentist choose a non-eugenol temporary cement instead of ZOE cement for the provisional restoration?

A dental assistant is fabricating a custom temporary crown using a preliminary impression taken before the tooth was prepared. What is this fabrication technique called?

What is the difference between a prefabricated temporary crown and a custom temporary crown?

After placing a temporary crown, the dental assistant checks the occlusion with articulating paper and finds a heavy mark on the mesiolingual cusp. What should be done?

A patient presents with a temporary crown that has an open margin on the lingual surface. The gingival tissue in that area appears red and inflamed. What is the most likely cause of the tissue irritation?

When trimming a temporary crown, the dental assistant notices that the interproximal contact is too tight, making it difficult to pass dental floss. What is the appropriate action?

What is the primary purpose of a temporary bridge (fixed provisional prosthesis) placed after multiple teeth are prepared?

A patient returns to have a temporary crown removed before cementation of the permanent crown. Which instrument is typically used to carefully dislodge a temporary crown cemented with ZOE?

A dental assistant is selecting a temporary cement for a provisional crown. The prepared tooth has a history of sensitivity, and the final restoration will be an all-ceramic crown bonded with resin cement. Which temporary cement is the best choice?

Why is it important for a temporary restoration to maintain proper interproximal contact with adjacent teeth?

After trimming and polishing a custom temporary crown, the dental assistant evaluates the margins. The margin on the facial surface appears to extend 1 mm beyond the prepared finish line. What should be done?

What is the term for the mechanical process of mixing amalgam alloy with mercury?

The dental assistant is preparing to mix amalgam. The dentist requests a large restoration mix. Which adjustment should the assistant make on the amalgamator?

Which instrument is used to pack amalgam into a prepared cavity?

After the dentist completes an amalgam restoration, the assistant observes that the occlusal anatomy needs to be refined. Which instrument would the dentist use to carve the anatomy of the restoration?

What is the purpose of burnishing an amalgam restoration?

Which type of composite resin contains larger filler particles and is designed for posterior restorations where higher strength is needed?

A patient requires a composite restoration on tooth #8. The dental assistant is preparing the shade guide. When should shade selection for the composite be performed?

What is the concentration of phosphoric acid most commonly used as an etchant in composite bonding procedures?

During a composite restoration, the dentist asks the assistant to prepare the etchant. After the etchant is applied and the recommended time has elapsed, what is the next step?

A dental assistant is assisting with a deep Class II composite restoration. The dentist places the composite in a single large increment and light cures it. The patient returns two weeks later with sensitivity. What is the most likely cause of the sensitivity?

What is the recommended curing time for most light-cured composite resins per increment?

The dentist has completed a composite restoration on tooth #5 and asks the assistant to help with finishing. Which rotary instrument is typically used first to contour and shape a composite restoration?

After finishing a composite restoration, what is the purpose of polishing?

A dental assistant notices that composite restorations placed in the office have been requiring frequent repairs due to fractures. The curing light is checked and produces adequate intensity. Which factor should be investigated next?

Which type of composite contains a blend of different filler particle sizes to provide both strength and polishability?

An amalgam mix appears dry and crumbly when expressed from the capsule. The dental assistant set the amalgamator to the standard speed and time. What is the most likely cause?

What is the primary health hazard associated with mercury vapor exposure in a dental office that uses amalgam?

A dental assistant notices that a bottle of bonding agent has passed its printed expiration date. What is the appropriate action?

What type of container should be used to store amalgam scrap and extracted teeth with amalgam restorations?

What is the purpose of an amalgam separator in a dental office?

A patient reports a history of latex allergy before a restorative procedure. Which action should the dental assistant take regarding dental materials?

A dental assistant is organizing the chemical storage area and finds glutaraldehyde disinfectant, acid etch gel, and composite bonding resin on the same shelf. Which storage concern should be addressed first?

After placing a temporary restoration using eugenol-containing cement, the patient reports a burning sensation in the soft tissue adjacent to the tooth. What is the most likely cause?

Which mercury hygiene practice should be followed when preparing amalgam in a dental office?

A dental material manufacturer changes the formulation of a composite resin, and the Safety Data Sheet is updated. What is the dental assistant’s responsibility regarding the new SDS?

Which factor most directly affects the shelf life of light-cured composite resin materials?

A dental assistant notices that a patient develops contact dermatitis on their lips after a composite restoration is placed. Which material component is the most likely cause of this reaction?

How should dental materials requiring specific temperature storage, such as certain impression materials and cements, be managed in the office?

The dental office is evaluating whether to continue offering amalgam restorations. From a material safety perspective, which consideration is most relevant to the dental assistant’s daily practice?

Which type of dental wax is used to create a pattern for a cast metal restoration?

Which property must a casting wax exhibit to produce an accurate cast metal restoration?

Type V gypsum is also known by which common name?

A dental assistant is mixing dental stone and notices that the material is hardening before the pour is complete. Which factor most likely caused the reduced setting time?

What is setting expansion in dental gypsum products?

A dental assistant is using a model trimmer to finish a set of diagnostic casts. Which safety precaution is most important when operating the model trimmer?

When pouring a dental impression with Type III stone, what technique should the dental assistant use to minimize air bubbles in the cast?

What is the purpose of applying a separation medium to a dental impression before pouring gypsum?

A dental assistant prepares two batches of Type III dental stone using the same powder. The first batch has a smooth, creamy consistency while the second batch is thick and difficult to pour. What is the most likely explanation for the difference?

Which type of gypsum product is classified as die stone and is used to create highly accurate dies for indirect restorations?

Type IV die stone has which of the following characteristics compared to Type II model plaster?

Which mechanical property measures the ability of a gypsum product to resist crushing forces?

When mixing alginate impression material by hand, what technique should the dental assistant use?

In a two-viscosity impression technique using polyvinyl siloxane (PVS), what is the purpose of the light-body (syringe) material?

After placing a temporary crown, the patient reports that it feels high when biting down. What should be done to correct this issue?

A dental assistant who routinely wears latex gloves develops redness, itching, and hives on her hands after glove use. What is the most likely cause, and what should she do?

After seating a temporary crown, the dental assistant checks the patient’s bite with articulating paper. The patient reports that the temporary feels high on one side. What should happen next?

What is the correct mixing technique for alginate impression material?

What is the process called when mercury and alloy powder are mechanically mixed together to form dental amalgam?

The dentist asks the dental assistant to mix zinc phosphate cement for cementation of a cast gold crown. What technique should the assistant use?

Which elastomeric impression material has the highest accuracy and dimensional stability over time?

What is the purpose of baseplate wax in dentistry?

A mercury spill occurs in the operatory when an amalgam capsule ruptures during trituration. What is the correct response?

A patient calls the office after their temporary crown came off over the weekend. What instruction should the dental assistant provide?

Which type of cement releases fluoride over time and bonds chemically to tooth structure?

A dental assistant is assisting with a composite restoration. The dentist places the composite in thin layers rather than filling the cavity all at once. What is the reason for this incremental placement technique?

Why is non-eugenol temporary cement preferred over zinc oxide eugenol (ZOE) cement when a tooth will receive a composite or porcelain restoration?

When mixing alginate for an impression, the dental assistant accidentally uses too much water. What effect will this have on the set impression?

What is the main difference between a hybrid composite and a microfill composite resin?

A dental assistant is trimming a study model on the model trimmer. What safety precaution is most important during this task?

What PPE should a dental assistant wear when handling liquid methyl methacrylate monomer during temporary crown fabrication?

What property of zinc oxide eugenol (ZOE) cement makes it useful as a temporary restorative material and sedative base?

What is the primary advantage of polyether impression material compared to other elastomeric materials?

What type of dental wax is used to take a preliminary record of the patient’s bite relationship?