Alternative Coinitiators Applicable to Photocurable Resin Composites

The composite resins available on the market today are mostly light-cured resins. So, photoinitiator molecules are included in these materials which have the ability to absorb light, and as result, generate free radicals which initiate the polymerization of these resin materials. 

Resin Composites
The light curing systems most commonly employed in the composites are the camphorquinone/amine system. The photoinitiator is camphorquinone, which requires a coinitiator to perform the polymerization process. Tertiary amines (aliphatic or aromatic) do not absorb light, but interact with the activated camphorquinone to produce reactive species. However, this photoinitiator system has some disadvantages, such as the tendency to promote yellowing to resin materials low compatibility with oral tissues  and even mutagenic characteristics.

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