Flashcards in resin composties 2 Deck (17):
what is optimal absorption of camphorquinone
what types of lights curing avalible?
quartz tungsten halogen
fibre optic light guide
What to LEDs provide?
portable and less bulky
at what heat is irreversible pulpitis caused?
how long should you wait between cycles to prevent heat build up?
What components re plasma arc curing?
considerable power- needs efficient cooling
apply for 2-3 seconds
what components re argon laser curing units?
minimal heat production
what is wear of composites influenced by?
What is resin matrix softening due to?
inhibition of polymreisation due to entrapped air pockets
chemical softening- food and plaque acids
what causes stress concentrations at resin/filler?
If porosity increases what happen re. crack propogation?
What causes crack propagation re. resin/ filler interface?
leakage of filler
stress corrosion of filler
what is the setting reaction re. silicates?
acid base reaction between illuminosilicate glass and phosphoric acid
what is the setting reaction re. acrylics?
free radical polymerisation
what are the stages of free radical addition polymerisaiton of methyl methacrylate?
compared to silicates, how are acrylics superior?
less prone to erosion