Methacrylate compositions modified by oligosilsesquioxanes with methacryl and cyclotriphosphazene substituents

Triethoxysilylphosphazenes have been synthesized via hydrosilylation of cyclotriphosphazenes with various contents of 4-allyl-2-methoxyphenoxy groups by triethoxysilane at an equimolar phosphazene–silane ratio. Hydrolytic copolycondensation of the latter compounds with ?-methacryloxypropyltrimethoxysilane resulted in oligosiloxanes involving functional methacrylic and phosphazene fragments. The oligomers have been used as additives to a dental composition based on bisphenol A-diglycidyl methacrylate and triethylene glycol dimethacrylate. The modified filled compositions are characterized by reduced (4-fold) sensitivity to external illumination and improved strength properties and microhardness.