Ch 6 Composites, Glass Ionomers Flashcards
What is the most common resin matrix?
Bis-GMA
What is the purpose of filler particles?
Filler particles strengthen the resin and protect against wear, and translucency.
What are the different types of fillers?
glass, quartz, silica, and ceramic.
What is the preferred size of fillers to prevent wear?
small compacted filler particles because they leave a smoother resin composite surface.
What is the purpose of a coupling agent?
A coupling agent binds the resin matrix to the inorganic fillers.
What is the name of the coupling agent used?
Silane
What is the process by which composite resins are light-cured to create free radicals and bring monomers together to form a polymer chain?
Polymerization
Why are macrofill composites not recommended?
They are large particles that cause the loss of filler and wear easily.
Which type of composite, according to its size is strong and retains shine?
Nanofill micro-hybrid
What is thermal conductivity?
The composite is able to transmit hot and cold temperatures like a natural tooth.
What is coefficient thermal expansion?
The amount of change a composite can experience without damage, greater than in natural teeth.
What is polymerization?
the shrinkage that occurs when the composite is cured
