Dental resin materials

Abstract

A polycarbonate dimethacrylate which is the condensation product of 2 parts of hydroxyalkylmethacrylate of the formula. ##STR1## in which A is C.sub.1 -C.sub.6 alkylene, and 1 part of a bis(chloroformate) of the formula ##STR2## in which R is C.sub.2 -C.sub.5 alkylene having at least two carbon atoms in its principal chain and n is an integer from 1 to 4, is usable, admixed with a secondary monomer suitable for dental applications, such as BIS-GMA; UDMA or the like, as an adhesive system for dental restorative materials. Particularly useful is the novel condensation product of 2-hydroxyethylmethacrylate and triethylene glycol bis(chloroformate). Dental adhesives containing these components are suitable for application to enamel, pretreated dentin, porcelain and metallic surfaces. The dentin surfaces are pretreated by application of an alcoholic solution of an alkali metal salt of benzene sulfinic acid. The resinous adhesives of the invention can be used in dental compositions which are visible lighting curing, self-curing, dual curing, heat and pressuring curing, or any combination thereof. Where the resinous adhesive is a self-curing adhesive, the polymerization accelerator, which is a tertiary amine such as dihydroxyethyl-p-toluidine, can optionally be incorporated into the alcoholic pretreatment solution. The condensation product is also suitable for use in filled compositions in which the filler material comprises inorganic silicates.