Dental Materials: Properties and Uses for Dental Assistants

Question 1

Which compound is NOT a fundamental part of the composition of composite resins?

Accepted Answer

Metals

Answer

Glass particles

Answer

Monomers

Answer

Initiators

Question 2

Which cement type is generally used to bond permanent crowns and bridges?

Accepted Answer

Resin-modified glass ionomer cement

Answer

Glass ionomer cement

Answer

Zinc phosphate cement

Answer

Polycarboxylate cement

Question 3

The setting process of impression materials is chiefly influenced by:

Accepted Answer

Temperature and moisture

Answer

Light

Answer

Presence or absence of oxygen

Answer

Pressure

Question 4

Which material among the following has the highest compressive strength?

Accepted Answer

Amalgam

Answer

Glass ionomer cement

Answer

Composite resin

Answer

Zinc phosphate cement

Question 5

Which of the following is **NOT** a characteristic of dental amalgams?

Accepted Answer

Adhesion to tooth structure

Answer

High compressive strength

Answer

Dimensional stability

Answer

Resistance to corrosion

Question 6

Which type of dental cement is most commonly used to bond crowns and bridges to the prepared tooth structure?

Accepted Answer

Resin cement

Answer

Temporary cement

Answer

Zinc phosphate cement

Answer

Glass ionomer cement

Question 7

What is the primary purpose of impression materials used in dentistry?

Accepted Answer

To accurately capture the negative form of the teeth and surrounding tissues for diagnostic or restorative purposes.

Answer

To fill dental cavities.

Answer

To bond dental restorations to the tooth.

Question 8

Which property is particularly important to consider when selecting a dental material for areas subjected to high forces, such as the posterior teeth?

Accepted Answer

Strength

Answer

Biocompatibility

Answer

Cost

Answer

Esthetics

Question 9

What is the primary function of fluoride incorporated into certain dental materials?

Accepted Answer

To inhibit tooth decay by strengthening tooth enamel and reducing demineralization.

Answer

To enhance the esthetics of the restoration.

Answer

To increase the overall strength of the material.

Question 10

Which factor is crucial in ensuring a successful bond between a dental material and tooth structure?

Accepted Answer

Proper surface preparation of the tooth, including cleaning and conditioning.

Answer

The age of the patient.

Answer

Saliva contamination.

Question 11

Which dental material is commonly used for the fabrication of temporary crowns, providing an interim restoration while the definitive restoration is being prepared?

Accepted Answer

Bis-acrylic composite resin

Answer

Porcelain

Answer

Gold

Answer

Amalgam

Question 12

Why is it essential to adhere to strict infection control measures when handling dental materials?

Accepted Answer

To prevent cross-contamination, protect patients and dental professionals from infections, and maintain a hygienic work environment.

Answer

To ensure the accuracy and precision of dental restorations.

Answer

To minimize the risk of material failure.

Question 13

Which type of dental cement is primarily used for securing crowns and bridges due to its superior bonding strength?

Accepted Answer

Resin cement

Answer

Polycarboxylate

Answer

Zinc phosphate

Answer

Glass ionomer

Question 14

What is the primary purpose of using impression materials in dentistry?

Accepted Answer

To capture an accurate mold of the teeth and surrounding tissues

Answer

To protect teeth from decay

Answer

To bond restorations to teeth

Question 15

Which characteristic is NOT typically associated with composite dental materials?

Accepted Answer

Brittleness

Answer

Adhesion

Answer

Strength

Answer

Versatility

Question 16

What is a crucial responsibility of a dental assistant in relation to dental materials?

Accepted Answer

Ensuring proper storage, handling, and disposal practices

Answer

Making independent decisions on material selection

Answer

Diagnosing dental conditions and recommending materials

Answer

Exclusively mixing and preparing materials for dentists

Question 17

When selecting a dental impression material for a specific clinical scenario, which factor should be given the highest priority?

Accepted Answer

Accuracy and detailed reproduction of the oral structures

Answer

Ease of use and convenience

Answer

Cost-effectiveness

Answer

Brand reputation

Question 18

In dentistry, which cement is frequently used to secure crowns and bridges?

Accepted Answer

Resin cement

Answer

Glass ionomer cement

Answer

Zinc phosphate cement

Answer

Polycarboxylate cement

Question 19

What is the primary purpose of using a bonding agent when placing dental composites?

Accepted Answer

Enhancing adhesion to the tooth structure

Answer

Improving color match

Answer

Reducing polymerization shrinkage

Answer

Providing radiopacity

Question 20

Which factor is known to have a detrimental effect on the bond strength between dental materials and tooth structure?

Accepted Answer

Moisture contamination

Answer

Light intensity

Answer

Age of the patient

Answer

Placement time

Question 21

In restorative dentistry, what is the primary reason for using a rubber dam?

Accepted Answer

Isolating the treatment area and preventing contamination

Answer

Providing illumination

Answer

Enhancing patient comfort

Question 22

Composite materials rely on which bonding mechanism?

Accepted Answer

Micromechanical

Answer

Covalent bonding

Answer

Van der Waals forces

Answer

Ionic bonding

Question 23

Which technique minimizes gaps at the margins of composite restorations?

Accepted Answer

Incremental layering

Answer

Hand carving

Answer

Bulk placement

Answer

Ultrasonic condensation

Question 24

What is the primary component of dental amalgam?

Accepted Answer

Mercury

Answer

Copper

Answer

Tin

Answer

Silver

Question 25

Which material is used to reinforce cores in restorative dentistry?

Accepted Answer

Glass fiber post

Answer

Bleaching solution

Answer

Etching gel

Answer

Temporary cement

Question 26

What is the primary purpose of using a bonding agent in dentistry?

Accepted Answer

To enhance adhesion between materials

Answer

To modify the pH of the environment

Answer

To provide thermal insulation

Answer

To inhibit bacterial growth

Question 27

Which material is considered a temporary restorative material?

Accepted Answer

Temporary crown

Answer

Composite filling

Answer

Bridge

Answer

Dental implant

Question 28

What is the primary component of dental amalgam?

Accepted Answer

Mercury

Answer

Zinc

Answer

Silver

Answer

Copper

Question 29

Which type of dental cement is commonly used for bonding crowns and bridges?

Accepted Answer

Resin cement

Answer

Glass ionomer cement

Answer

Polycarboxylate cement

Answer

Zinc oxide-eugenol cement

Question 30

What is the purpose of a bite registration material?

Accepted Answer

To record the relationship between the upper and lower jaws

Answer

To protect teeth from wear and tear

Answer

To repair cracked or damaged teeth

Question 31

What is a major advantage of using indirect bonding for dental veneers?

Accepted Answer

Enhanced marginal adaptation

Answer

Lower cost

Answer

Faster treatment time

Answer

Reduced sensitivity

Question 32

What is the ideal temperature for storing dental impression materials?

Accepted Answer

23°C (73°F)

Answer

37°C (98.6°F)

Answer

0°C (32°F)

Answer

4°C (39°F)

Question 33

Which material is primarily used to repair fractured porcelain crowns?

Accepted Answer

Resin composite

Answer

Metal alloy

Answer

Glass ionomer cement

Answer

Zirconia

Question 34

What is the primary role of a dental luting agent?

Accepted Answer

To bond dental prostheses to tooth structure

Answer

To whiten teeth

Answer

To improve oral hygiene

Answer

To prevent decay

Question 35

For orthodontic bracket bonding, which cement type is commonly employed?

Accepted Answer

Light-cured resin cement

Answer

Zinc phosphate cement

Answer

Glass ionomer cement

Answer

Polycarboxylate cement

Question 36

In traditional amalgam fillings, what element constitutes the primary component?

Accepted Answer

Mercury

Answer

Copper

Answer

Zinc

Answer

Silver

Question 37

Which cement is typically used as a temporary protective covering for prepared teeth before placing permanent restorations?

Accepted Answer

Zinc oxide eugenol cement

Answer

Glass ionomer cement

Answer

Resin-based cement

Question 38

What key advantage does flowable composite resin offer?

Accepted Answer

Convenient placement in areas with limited accessibility

Answer

Superior strength

Answer

Minimal shrinkage

Answer

Exceptional esthetics

Question 39

In the bonding process for composite resins, what is the primary purpose of silanization?

Accepted Answer

Enhancing the adhesive bond between the resin and tooth structure

Answer

Etching the tooth surface

Answer

Removing surface contaminants

Question 40

What is the main component of amalgam?

Accepted Answer

Mercury

Answer

Tin

Answer

Silver

Answer

Copper

Question 41

What is the purpose of using a rubber dam in restorative procedures?

Accepted Answer

To isolate the operative field from saliva and debris

Answer

To prevent the patient from biting the instruments

Answer

To enhance visibility

Question 42

Which of the following is NOT a property of glass ionomer cement?

Accepted Answer

High compressive strength

Answer

Fluoride release

Answer

Adhesion to tooth structure

Question 43

What is the primary function of a cavity liner?

Accepted Answer

To protect the pulp from thermal and chemical irritation

Answer

To etch the tooth surface

Answer

To reduce the depth of the cavity preparation

Question 44

What is the ideal moisture level for bonding with composite resin?

Accepted Answer

Slightly moist

Answer

Saturated

Answer

Dry

Answer

Wet

Question 45

What is the main advantage of using ceramic crowns?

Accepted Answer

Excellent aesthetics and biocompatibility

Answer

High strength

Answer

Low cost

Question 46

Which of the following is a major component of dental amalgam?

Accepted Answer

Silver

Answer

Gold

Answer

Tin

Answer

Copper

Question 47

What is the primary function of a dental cement?

Accepted Answer

To bond restorations to tooth structure.

Answer

To protect the pulp from irritation.

Answer

To enhance the esthetics of a restoration.

Answer

To provide a temporary barrier during cavity preparation.

Question 48

Which type of composite material is typically used for anterior restorations?

Accepted Answer

Microfilled

Answer

Flowable

Answer

Hybrid

Answer

Macrofilled

Question 49

What is the main advantage of using rubber dam isolation during dental procedures?

Accepted Answer

Prevention of moisture contamination.

Answer

Enhanced patient comfort.

Answer

Improved visualization of the treatment area.

Answer

Reduced risk of aspiration.

Question 50

Which impression material is most suitable for capturing fine details?

Accepted Answer

Polyether

Answer

Compound

Answer

Alginate

Answer

Silicone

Question 51

What is the primary difference between a direct and indirect restoration?

Accepted Answer

Direct restorations are placed directly into the prepared cavity, while indirect restorations are fabricated outside the mouth.

Answer

Direct restorations are temporized, while indirect restorations are permanent.

Question 52

Which type of cement is commonly used for luting crowns and bridges?

Accepted Answer

Resin-modified glass ionomer cement

Answer

Zinc phosphate cement

Answer

Polycarboxylate cement

Answer

Glass ionomer cement

Question 53

What is the most important factor to consider when selecting an impression material for a specific clinical situation?

Accepted Answer

The accuracy and detail required.

Answer

The ease of use.

Answer

The cost of the material.

Question 54

Which of the following is NOT a property of composite resin materials?

Accepted Answer

Low thermal conductivity.

Answer

High strength.

Answer

Good esthetics.

Answer

Low polymerization shrinkage.

Question 55

What is the purpose of using a bonding agent with composite resin materials?

Accepted Answer

To enhance the adhesion of the composite to tooth structure.

Answer

To reduce the risk of postoperative sensitivity.

Answer

To provide a protective layer over the composite.