Composites Dental Materials

The major components of composite dental materials include all of the following except

• Fillers

• Coupling agent

• Resin matrix

• Bonding agent

Composite resins are often classified according to their

• Strength

• Polishability

• Resin content

• Filler particle size

The shortcomings of flowable composites as compared with hybrid composites include all of the following except one

• They are weaker

• They wear faster

• They shrink more when polymerized

• They are more difficult to polish

The purpose of a silane coupling agent for composite resins is

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

• The help composite retain its color

• To reduce the oxygen inhibited layer

• To help the various layers stick together

The curing light requires repair if

• It causes a slower set of a dark color composite

• It has not been tested

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

• The light appears blue

The polymerization shrinkage of a composite

• Is cause for alarm

• Is greater than 10% of the volume

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

• Has no effect on final restoration

Fillers are composed of all of the following except one

• Quartz

• Alumina

• Silica

• Glass

Which one of the following statements about a coupling agent is false

• It minimizes the loss of filler particles

• It reduces wear

• It prevents filler from sticking to the resin

• It is made of silane

All of the following will increase the wear of a composite restoration except one

• Use of large filler particles

• Incompletely curing the composite

• Use of small amount of filler particles

• Saliva contamination of the etched enamel

Which one of the following types of composite is the weakest and should not be used in stress bearing tooth surfaces

• Hybrid

• Microfill

• Nanofill

• Nanohybrid