Widely used in dental materials, especially in light-curable resin-based composites and adhesives. It acts as a photoinitiator, enabling the polymerization process when exposed to blue light in the 400–500 nm range. Upon light activation, it generates free radicals that initiate the curing of methacrylate monomers, allowing rapid hardening of restorative materials directly in the tooth cavity. Its efficiency, stability, and biocompatibility make it a standard component in dental restorative systems. Also used in some 3D printing resins requiring visible light initiation.