Composites Flashcards
resin is a ______
___ polymer
dimethacrylate
vinyl polymer
fillers are inorganic/mineral ceramic ______;
______ and resist ____;
___% of composites are fillers
SiO2, ZO2, Ba glass
strong, wear
50%
coupling agents are ____
silanes
molecules that in one end covalently bond to the resin and covalently bond to inorganic filler in the other
silanes
silanes provide _________
mechanical continuity
without silanes at _____ interface, composite material would be ____
resin-filler, weak
_____ are scavengers of ___ _____ that prevent premature polymerization of resin; give ________
inhibitors, free radicals, stability on storage
UV stabilizers are molecules that absorb UV and prevent _____ of resin during use
yellowing
a unified combination of two or more materials designed to have better properties over individual components
composite
uses of composite materials
- pits and fissure sealants
- resin composite fillings
- luting cements
constituents of resin composites (6)
(DFCIIU)
- dimethacrylate polymers
- fillers (organic)
- coupling agent
- (polymerization) inhibitors
- initiator/activator systems
- UV stabilizers
what is a silane?
a coupling agent
function of dimethacrylate resins
give rigid material, toughness
common examples of dimethacrylate resins
Bis-GMA, UDMA with TEGDMA
____ start polymerization of resin and are usually visible for light curing
initiators
