Chapter 6: Composite, Glass Ionomer, and Compomers

Question 1

The major components of composite dental materials include all of the following except one. Which one is the exception?
A. Bonding agent
B. Resin Matrix
C. Coupling Agent
D. Fillers

Answer 1

Bonding Agent

Question 2

Composite resins are often classified according to their?

Answer 2

Filler particle size

Question 3

The shortcomings of flowable composites as compared with hybrid composites include all of the following except one. Which one is the exception?
A. They are weaker
B. They wear faster
C. They shrink more when polymerized
D. They are more difficult to polish.

Answer 3

They are more difficult to polish

Question 4

The purpose of a silane coupling agent for composite resins is…?

Answer 4

To improve the bond between the filler particles and the resin matrix.

Question 5

The curing light requires repair if…?

Answer 5

A 2 mm thick piece of composite does not cure through the bottom at the recommended exposure time.

Question 6

The polymerization shrinkage of a composite….?

Answer 6

Can be minimized by placing and curing a series of small increments.

Question 7

Fillers are composed of all of the following except one. Which one is the exception?
A. Quartz
B. Alumina
C. Silica
D. Glass

Answer 7

Alumina

Question 8

Which one of the following statements about a coupling agent is false?
A. It minimizes the loss of filler particles
B. It reduces wear
C. It prevents filler from sticking to the resin
D. It is made of silane

Answer 8

It prevents filler from sticking to the resin

Question 9

All of the following will increase the wear of a composite restoration except one. Which one is the exception?
A. Use of large filler particles
B. Incompletely curing the composite
C. Used of small amount of filler particle
D. Saliva contamination of the etched enamel

Answer 9

Saliva contamination of the etched enamel

Question 10

Which type of composite is the weakest and should not be used in stress-bearing tooth surfaces?

Answer 10

Microfill

Question 11

Heavily filling the resin matrix with nanosized filler particles will reduce what?

Answer 11

Polymerization shrinkage

Question 12

Which composite attains a high shine when polished that lasts the longest?

Answer 12

Nanocomposite

Question 13

Which type of composite generally will shrink the most when polymerized?

Answer 13

Flowable composite.

Question 14

Common effects of polymerization shrinkage of composites may include all of the following except one. Which one is the exception.
A. Mircoleakage
B. Death of the pulp
C. Microcracking of enamel causing white lines around the margins
D. Postoperative sensitivity

Answer 14

Death of the pulp

Question 15

Methods used to minimize polymerization shrinkage include all of the following except one. Which one is the exception?
A. Cure the composite rapidly with a high-intensity light
B. Use prepolymerized filler clusters
C. Use composite with a high filler content
D. Place composite using small increments

Answer 15

Cure the composite rapidly with a high-intensity light

Question 16

All of the following may require a longer curing time for a composite except one. Which one is the exception?
A. Use of an opaque shade
B. Use of increments of composite greater than 2mm
C. Placement of the curing light tip 6 to 8 mm from the composite
D. Composite placed in a class III preparation on #8 mesial

Answer 16

Composite placed in a class III preparation on #8

Question 17

What allows a new increment of composite to stick to the previously cured increment?

Answer 17

Chemical resin-to-resin bond

Question 18

The function of the wedge placed interproximally with a class II preparation includes all of the following except one. Which one is the exception?
A. Stop bleeding
B. Create slight separation of the teeth
C. Seal the matrix band against the tooth at the gingival margin
D. Protect the gingival papilla during cavity preparation

Answer 18

Stop bleeding

Question 19

One of the advantages of glass ionomer compared to composite is…?

Answer 19

That is has been show to release fluoride.

Question 20

Which of the following statements about glass ionomer cement (GIC) is false?
A. GIC chemically bonds to the mineral of the tooth
B. GIC releases fluoride
C. GIC functions well for class II restorations
D. GIC reduces microleakage at margins of a restoration on the root.

Answer 20

GIC functions well for class II restorations.

Question 21

Hybrid (resin-modified) glass ionomers have all of the following advantages over conventional glass ionomers except one. Which one is the exception?
A. Stronger
B. Less sensitive to moisture when set
C. Can be finished at the same appointment
D. Contain quartz fillers like some composites

Answer 21

Contain quartz fillers like some composites

Question 22

Nano-ionomers have all of the following properties except one. Which one is the exception?
A. Improved esthetics
B. Increased wear resistance
C. Improved polish
D. Greater strength than nanocomposites

Answer 22

Greater strength than nanocomposites

Question 23

Compomer restoration materials…?

Answer 23

Are closer to composite resins in their makeup than to glass ionomers.