What is the main component of the organic resin matrix in composites?

The main component of the organic resin matrix in dental composite materials is BIS-GMA, also known as bisphenol A diglycidyl ether methacrylate. This compound is a type of methacrylate that provides the necessary properties for a resin matrix, such as strength, adhesion, and chemical resistance. The structure of BIS-GMA contributes to the overall performance of the composite, allowing it to bond effectively to tooth structure while also providing the durability needed for dental restorations.

BIS-GMA is critical for the polymerization process, which occurs when it is exposed to light (in light-cured composites) or chemical agents (in self-cured composites), resulting in a strong and stable material that can withstand the forces of chewing. Its unique properties enable it to form a matrix that can effectively encapsulate reinforcing materials, such as glass or silica particles, enhancing the mechanical and aesthetic characteristics of the composite.

Other substances mentioned in the options serve different roles. Silicate cement is predominantly used in other types of dental restorations and does not serve as an organic resin matrix. Camphor quinone is a photoinitiator used in the polymerization process of composites but is not a primary component of the resin matrix itself. Infilled