Light curable dental liquid or paste

Claim 1

A light curable dental liquid or paste comprising an ethylenic unsaturated monomer, a light polymerization initiator and an organic filler, said light polymerization initiator comprising a combination of an organic peroxide and a pyrylium salt compound represented by the following general formula (I) of: ##STR6## wherein R 1 , R 2 and R 3 each represents the same or different atom or group and stands for a hydrogen atom, a halogen atom, an alkyl group, a haloalkyl group, an ethylenyl group, a styryl group, an alkoxy group, a phenyl group, a naphthyl group, an alkylphenyl group, an alkylstyryl group, an alkylnaphthyl group, an alkoxyphenyl group, an alkoxystyryl group, an alkoxynaphthyl group, a hydroxyphenyl group, a hydroxystyryl group, a hydroxynaphthyl group, a halophenyl group, a halostyryl group, a halonaphthyl group, a nitrophenyl group, a nitrostyryl group, a nitronaphthyl group, a aminophenyl group, an aminostyryl group, an aminonaphthyl group, an alkylaminophenyl group, an alkylaminostyryl group, an alkylaminonaphthyl group, a nitro group, an amino group or a hydroxyl group, X stands for an oxygen atom or a sulfur atom and Y for an anionic functional group, said organic peroxide being a tetraperoxy ester containing a benzophenone group and represented by the following general formula (II) of: ##STR7## wherein R 1 and R' 1 each represent a tertiary alkyl group having 4 to 8 carbon atoms and R 2 and R' 2 each represents a tertiary alkoxy group having 4 to 8 carbon atoms, said organic filler being a polymer obtained by polymerizing a feed monomer containing at least an ester of carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof, said feed monomer further containing an unsaturated comonomer copolymerizable with and different from said ester of carboxylic acid, said unsaturated comonomer being represented by the following general formula (III) of: ##STR8## wherein R 1 is a hydrogen atom or a methyl group, R 2 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, and n is an integer of 1 to 15.