Dental composite chemistry
C factor – ratio of bonded to unbonded surfaces in the preparation
- Organic resin matrices
- Inorganic fillers consisting of proprietary combinations of zinc, alumina, silica, quartz, and zirconia. This is where most of the evolution of composites has occurred.
- Pre-polymerized resins as a coupling agent
Silane – tris(2-methoxyethoxy) vinyl silane bonds silica to polymer
- Camphoroquinone (yellow) first one used after UV (1978). Most common today at 470nm peak. Disadvantage is yellow color and peak absorption in visible range.
- Ivocerin (Dibenzoyl germanium derivative?) allows increase depth of cure for Tetric EvoCeram Bulk
- Monoaclyphosphine oxide (Lucirin TPO 2,4,6-Trimethylbenzoyldiphenylphosphine oxide?)
- Phenyl Propanedione (PPD)
- Original composite used UV initiated chemical but was not in use for very long
Photoinitiators 2 and 3 are from an article I reviewed in General Dentistry. Different article that I like. Santini