Chapter 8 Composites

A dental composite restoration fails due to the debonding of filler particles. Which component is most likely deficient or malfunctioning, and what is the consequence?

• Resin matrix; leads to increased esthetics

• Coupling agent; leads to fracture or wear

• Initiator/activator system; leads to rapid hardening

• Inorganic filler particles; leads to color change

What is the primary role of filler particles in dental composites?

• Improve mechanical strength, wear resistance, polishability, and shrinkage control

• Change the color of the composite

• Increase the curing time

• Reduce the cost of the composite

A dentist is choosing a composite for a restoration that requires high polish, strength, and esthetics. Which type of filler should they select?

• Nanofilled

• Macrofilled

• Microfilled

• Hybrid

Explain why incremental placement is important in dental composite procedures and how it helps minimize polymerization shrinkage.

• It allows the composite to be placed in layers, reducing the overall shrinkage that occurs during polymerization and improving the adaptation to cavity walls.

• It makes the composite harder.

• It increases the esthetic value of the composite.

• It reduces the need for curing lights.

A dentist is working on a small cavity and needs a low-viscosity material for easy placement. Which composite should be selected and why?

• Flowable Composite, because it is designed for small cavities, liners, or around margins due to its low viscosity.

• Macrofilled Composite, because it is strong but rough.

• Hybrid Composite, because it combines small and large filler particles.

• LED Curing, because it uses blue light.

A dentist wants a composite material that provides both high polish and strength for a restoration. Which type should they choose?

• Microhybrid

• Macrofilled

• Bulk-fill

• Hybrid

Which composite type is best used for anterior restorations due to its excellent polishability but has low strength?

• Microfilled

• Hybrid

• Bulk-fill

• Nanofilled