Deck 4: Direct Esthetic Restorative Materials

Question 1

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

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

Answer 1

Composite

Question 2

The setting reaction of a composite restorative material is:

A) gelation.
B) polymerization.
C) hysteresis.
D) reduction.

Answer 2

polymerization.

Question 3

Advantages of placing composite into the plastic tip of a syringe and injecting it into the cavity preparation include that the syringe:

A) allows the use of small mixes.
B) reduces incorporation of voids into the composite during insertion.
C) facilitates placement of the material in the areas of retention.
D) A, B, and C.
E) A and C.

Answer 3

A, B, and C.

Question 4

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

Question 5

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

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

Question 6

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 7

When microhybrid composites are contrasted with microfilled composites:

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

Question 8

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 9

In a visible,light-curing,direct composite system,the light is absorbed by a(n):

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

Question 10

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 11

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 12

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) Bulk addition of composite will reduce the effective shrinkage.
D) Incremental addition and polymerization of composite in layers will reduce the effective shrinkage.

Question 13

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

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

Question 14

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

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

Question 15

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

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

Question 16

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

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

Question 17

Flowable composites:

A) are recommended for low-stress-bearing restorations.
B) have a low modulus of elasticity.
C) have a high modulus of elasticity.
D) A and B.
E) A and C.

Question 18

Which type of composite has the smallest filler particle size?

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

Question 19

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

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

Question 20

The most likely cause(s)of sensitivity following placement of composite restorations is(are):

A) an occlusal interference.
B) the use of acid etchant during placement.
C) induced internal stress.
D) microleakage of bacteria.
E) both C and D.

Question 21

The composition of composite resin material consists of:

A) organic filler particles.
B) inorganic filler particles.
C) resin matrix.
D) all of the above.
E) only B and C.

Question 22

The smear layer consists of:

A) calcium hydroxide.
B) hydroxyapatite and partially denatured collagen.
C) etchant.
D) primer.
E) adhesive.

Question 23

The polymerization reaction of a self-cure composite resin is initiated by:

A) visible curing light system.
B) diketone in the presence of an organic amine.
C) organic peroxide initiator.
D) dimethacrylate.

Question 24

Postoperative sensitivity can be avoided by:

A) placing smaller layers of material.
B) using a low-strength liner.
C) using a high-strength base.
D) all of the above.
E) only A and C.

Question 25

Advantages of composite provisional materials over acrylic provisional materials include:

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

Question 26

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

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

Question 27

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 28

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 easier to contour than amalgam materials.
D) A, B, and C are correct.
E) A and C are correct.

Question 29

Bond strength is exceeded and gaps occur at the cavosurface margin as a result of:

A) inadequate cure.
B) saliva contamination.
C) inadequate etch.
D) polymerization shrinkage.

Question 30

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

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

Question 31

Glass ionomers are typically reserved for which type of restoration?

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

Question 32

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

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

Question 33

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

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

Question 34

The elastic modulus of composite materials for posterior restorations is dominated by:

A) stiffness of the filler.
B) low filler content.
C) high filler content.
D) percentage of matrix.

Question 35

Organic fillers that are radiolucent include:

A) crystalline silica.
B) lithium aluminum silicate.
C) strontium.
D) all of the above.
E) only A and B.

Question 36

Organic fillers that are radiopaque include:

A) crystalline silica.
B) lithium aluminum silicate.
C) strontium.
D) all of the above.

Question 37

Composite materials are superior materials for anterior restorations because of:

A) minimal surface erosion.
B) minimal degradation in the oral environment.
C) resistance to biting forces.
D) low rate of recurrent caries.

Question 38

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 39

Compomers are recommended for patients with _____ risk.

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

Question 40

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