Composites

Question 1

What influences the overall color of teeth?

Answer 1

Dentin

Question 2

Coefficient of Thermal Expansion

Answer 2

change in length of material by temperature
decrease temp = shrink
increase temp = expand
*can cause sensitivity or microleakage

Question 3

Percolation

Answer 3

process of heating/cooling that causes gaps to open/close at restoration margins
*leads to leakage and recurrent decay

Question 4

Polymerization

Answer 4

chemical reaction converting smaller particles into giant polymer molecules
*ie: composites, sealants, acrylics

Question 5

Components of Composites

Answer 5

Matrix = BIS GMA - weak
Filler = engineered glass - strong, hard
Silane Coupling Agents = adhesion of materials and to tooth

Question 6

Filler determines

Answer 6

smoothness, strength, radiopacity

Question 7

Filler types

Answer 7

macrofilled (obsolete, older patients), microfilled (smooth, lower strength), hybrid (strong, nanofilled (strong, optics)