Deck 4: Direct Esthetic Restorative Materials

Question 1

Which of the following statements is correct when contrasting microhybrid composites with microfilled composites?

A) Microhybrid composites have higher water sorption.
B) Microfilled composites have higher compressive strength.
C) Microhybrid composites have more polymerization shrinkage.
D) Microhybrid composites have a lower elastic modulus in compression.
E) Microfilled composites have a higher linear coefficient of thermal expansion.

Answer 1

Microhybrid composites have a lower elastic modulus in compression.

Question 2

Which of the following direct esthetic restorative materials releases the least fluoride?

A) Hybrid ionomer
B) Glass ionomer
C) Compomer
D) Composite

Answer 2

Composite

Question 3

The more resin matrix, the _________ the linear coefficient of thermal expansion, because the polymer has a _________ value than the filler.

A) higher; higher
B) higher; lower
C) lower; higher
D) lower; lower

Answer 3

higher; higher

Question 4

What is/are the most likely cause(s) of sensitivity following placement of composite restorations?

A) Induced internal stress
B) An occlusal interference
C) Microleakage of bacteria
D) The use of acid etchant during placement
E) Both B and D

Question 5

With _______-generation bond agents, etching and priming are accomplished at the same time, and rinsing is not required.

A) third
B) fourth
C) fifth
D) sixth

Question 6

Which of the following statements is true of flowable composites when contrasted with microhybrid composites?

A) They have lower viscosity than microhybrid composites.
B) They have a higher filler content than microhybrid composites.
C) They have higher wear resistance than microhybrid composites.
D) They exhibit lower polymerization shrinkage than microhybrid composites.

Question 7

A bond strength of _____ MPa is an estimated requirement to prevent marginal gaps as a result of polymerization shrinkage during placement of composite restorations.

A) 0.01
B) 1
C) 10
D) 20

Question 8

Which of the following statements is true of silane in composite materials?

A) Silane forms the dispersed inorganic filler particles.
B) Silane forms the dispersed organic filler particles.
C) Silane is a coupling agent on the filler particles.
D) Silane forms the resin matrix.

Question 9

Which of the following is not a direct esthetic restorative material?

A) Ceramic
B) Composite
C) Compomer
D) Glass ionomer

Question 10

Currently acceptable composites for posterior applications require clinical studies demonstrating a loss of surface contour less than _____ µm over a 5-year period.

A) 5
B) 50
C) 100
D) 250
E) 5000

Question 11

What is/are (an) advantage(s) of placing composite into the plastic tip of a syringe and injecting it into the cavity preparation?

A) Allows the use of large mixes
B) Facilitates placement of the material in the areas of retention
C) Reduces incorporation of voids into the composite during insertion
D) A, B, and C are correct.
E) Only B and C are correct.

Question 12

Which of the following is the most popular direct esthetic dental restorative material?

A) Composite
B) Compomer
C) Glass ionomer
D) Hybrid ionomer

Question 13

Which of the following statements is true of polymerization shrinkage of composite restorative materials?

A) Microfilled composites shrink less than microhybrid composites, because microhybrid composites have less resin.
B) Stresses from polymerization shrinkage cannot exceed the bond strength of a composite to tooth structure.
C) Incremental addition and polymerization of composite in layers will reduce the effective shrinkage.
D) Bulk addition of composite will reduce the effective shrinkage.

Question 14

Which of the following statements is correct about flowable composite resins?

A) Are recommended for low-stress-bearing restorations
B) Have a high modulus of elasticity
C) Have a low modulus of elasticity
D) A and B
E) A and C

Question 15

Which of the following statements is true of single- and two-paste composites?

A) Single-paste composites are light activated.
B) Single-paste composites may be dual cured.
C) Compules are a component of two-paste composites.
D) An automix syringe is a component of single-paste composites.

Question 16

Which type of composite has the smallest filler particle size?

A) Microhybrid
B) Microfilled
C) Nanofilled
D) Packable
E) Flowable

Question 17

Sensitivity associated with placement of composite restorations has been reported in about ____% of cases.

A) 1
B) 10
C) 25
D) 50
E) 75

Question 18

Which type of setting reaction is utilized by a composite restorative material?

A) Gelation
B) Reduction
C) Hysteresis
D) Polymerization

Question 19

In a visible, light-curing, direct composite system, which component is the light absorbed by?

A) Diketone, which starts the polymerization reaction in the presence of an organic peroxide initiator
B) Diketone, which starts the polymerization reaction in the presence of an organic amine
C) Organic peroxide initiator and organic amine accelerator
D) Organic peroxide initiator alone

Question 20

Which type of direct composite has a wear rate most similar to dental amalgam?

A) Packable composite
B) Flowable composite
C) Microfilled composite
D) Microhybrid composite

Question 21

When composites are repaired, the repair bond strength is about ________% of the cohesive strength of the original composite.

A) 100 to 120
B) 80 to 100
C) 60 to 80
D) 40 to 60
E) 20

Question 22

What are the components of the smear layer?

A) Hydroxyapatite and partially denatured collagen
B) Calcium hydroxide
C) Adhesive
D) Etchant
E) Primer

Question 23

What component initiates the polymerization reaction of a self-cure composite resin?

A) Diketone in the presence of an organic amine
B) Visible curing light system
C) Organic peroxide initiator
D) Dimethacrylate

Question 24

Why are composite materials for anterior restorations used over other restorative materials?

A) Minimal surface erosion
B) Resistance to biting forces
C) Low rate of recurrent caries
D) Minimal degradation in the oral environment

Question 25

In the event that an esthetic material is required for a direct, posterior, load-bearing restoration, _________ composite is the material of choice.

A) core
B) flowable
C) packable
D) laboratory

Question 26

How can postoperative sensitivity be avoided?

A) Placing larger layers of material
B) Using a high-strength base
C) Using a low-strength liner
D) All of the above are correct.
E) Only B and C are correct.

Question 27

Which of the following statements is true when contrasting composite core material with amalgam?

A) Composite can be finished immediately and prepared for a crown at the same appointment, whereas amalgam cannot be prepared for a crown at the same appointment.
B) Composite materials have good color under ceramic, but amalgam does not.
C) Composite materials are more difficult to contour than amalgam materials.
D) A, B, and C are correct.
E) A and B are correct.

Question 28

What does the composition of composite resin material consist of?

A) Resin matrix
B) Organic filler particles
C) Inorganic filler particles
D) A and B are correct.
E) A and C are correct.

Question 29

Which of the following organic fillers are radiopaque?

A) Lithium aluminum silicate
B) Crystalline silica
C) Strontium
D) A, B, and C are all correct.

Question 30

Glass ionomers are typically reserved for which type of restoration?

A) Posterior interproximal lesions
B) Anterior interproximal lesions
C) Cervically eroded areas
D) Pit and fissure lesions

Question 31

What occurs if bond strength is exceeded and gaps occur at the cavosurface margin?

A) Inadequate cure
B) Inadequate etch
C) Saliva contamination
D) Polymerization shrinkage

Question 32

Which of the following statements is true regarding composite curing times?

A) Darker shades require shorter curing times than lighter shades.
B) Curing times with PAC lights are longer than for QTH or LED lights.
C) Microhybrid composites require longer curing times than microfilled composites.
D) More opaque composites require longer curing times than more translucent composites.

Question 33

It is recommended that glass ionomer restorations be used in Class _____ restorations where esthetics is not critical.

A) I
B) II
C) III
D) IV
E) V

Question 34

Which of the following have the highest rates of thermal expansion?

A) Nanofilled composites
B) Microfilled composites
C) Macrofilled composites
D) Microhybrid composites

Question 35

Which of the following organic fillers are radiolucent?

A) Lithium aluminum silicate
B) Crystalline silica
C) Strontium
D) A and B are correct.
E) B and C are correct.

Question 36

Why would a dentin bonding agent not be used when placing a resin-modified glass ionomer?

A) It decreases the release of fluoride
B) Using a curing light is not necessary.
C) The material does not bond to tooth structure.
D) The material is used for temporary restorations.

Question 37

Which of the following is not true about composite resin materials?

A) High strength
B) Esthetically pleasing
C) High wear resistance
D) High fluoride content

Question 38

Compomers are recommended for patients with ______________ risk.

A) low caries
B) medium caries
C) high caries
D) any level of

Question 39

Which of the following do compomers contain?

A) Dimethacrylate (Bis-GMA)
B) Urethane dimethacrylate (UDMA) oligomers
C) Monomers modified by polyacid groups with fluoride-releasing silicate glasses.
D) A powder of aluminosilicate glass and a water solution of polymers and copolymers of acrylic acid.

Question 40

Advantages of composite provisional materials over acrylic provisional materials include

A) lower cost.
B) harder, more brittle texture.
C) doughy stage for easier handling.
D) lower heat release during curing.

Question 41

Which of the following esthetic restorative materials is best suited for Class I posterior restorations?

A) Microfilled
B) Microhybrid
C) Glass ionomer
D) Bulk composite

Question 42

Compare and contrast direct placement resins to laboratory resins.

Question 43

Why is it important to finish and polish a composite restoration after it is placed?

A) Reduces staining
B) Prevents percolation
C) Eliminates microleakage
D) Maintains good oral hygiene

Question 44

Compare and contrast microfilled and microhybrid composite resin materials.

Question 45

Explain the process of polymerization shrinkage of composite resin materials and why it is significant in the life of a restoration.