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Depending on the filler content, they are classified as:
Type I or unfilled resins
Type II or composites or filled resins
Addition of fillers increases the strength hardness, abrasion resistance and decreases. the polymerization shrinkage and water sorption.
Composites are classified depending upon the average size of the filler particles that form a major component of filler system:
Midifillers
Minifillers
Microfillers
nanofillers
1 to 10 microns
0.1 to 1 microns
0.01 to 0.1 microns
0.005 to 0.01 microns
Prevents premature polymerization
Titanium dioxide and aluminum oxide are the opacifiers.
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