Composite Resins Flashcards
what are direct filling materials used for
new dental caries
abrasion
erosion
failed restorations and secondary caries
trauma
what are the ideal properties of direct filling materials
strength, rigidity and hardness
bonding to tooth
compatible with bonding systems
thermal properties
aesthetics
handling and viscosity
smooth surface finish - polishable
low setting shrinkage
radiopaque
anticariogenic
biocompatible
what are the “ingredients” of composite resin
filler particles
resin
camphorquinone
low eight dimethylacrylates
silane coupling agent
what are some of the possible filler particles of composite
- microfine silica
- quartz
- borosilicate glass
- lithium aluminium silicate
- barium aluminium silicate
which monomers are used for resin in composite
bis-gma
urethane dimethacrylates
what is bisgma a reaction product of
bisphenol-A and glycidyl methacrylate
what are the key characteristics of composite resin monomers
difunctional molecule - C=C bonds that facilitate cross linking
undergoes free radical addition polymerisation
describe camphorquinone
- activated by blue light
- produces radical molecules
- these initiate free radical addition polymerisation of bisgma
- leading to changes in resin properties
- causes degree of conversion of resin
