Final answer:
The most common photoinitiator in composites is benzoin methyl ether (BME).
Step-by-step explanation:
The most common photoinitiator in composites is benzoin methyl ether (BME) (C6H5CH(OCH3)C(O)CH3). It is widely used in composite materials for initiating the polymerization process when exposed to light.
Photoinitiators play a crucial role in the polymerization process of composite materials, especially in the context of photopolymerization or light-curing processes. These compounds are activated by exposure to light, initiating and promoting the polymerization of monomers or oligomers, leading to the formation of a solid composite. Photoinitiators are commonly used in the manufacturing of dental composites, adhesives, coatings, and other light-cured materials.