Light curing compositions for dental restoration

Claim 1

A light curing paste composition adapted for producing a film of 1 mm or more in thickness for dental restoration comprising the following five constitutional components: (a) a polymerizable compound containing at least one ethylenically unsaturated double-bond, (b) at least one photo-polymerization initiator selected from ketal base compounds expressed in terms of the following general formula (1): ##STR7## wherein X is H, Cl, an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms, A is a six-membered aromatic group, and R is an alkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 9 carbon atoms or a --C n H 2n O) m R' in which n is an integer of 2 to 5, m is an integer of 1 to 5, and R' is an alkyl group having 1 to 5 carbon atoms, in an amount of 0.01 to 1.0 weight % relative to polymerizable compound (a), (c) at least one photo-polymerization initiator selected from thioxanthone base compounds expressed in terms of the following general formula (2): ##STR8## wherein X indicates >S 1 >SO and >SO 2 , R and R' each represents a lower alkyl group, a substituted alkyl group, an alkoxy group, a halogen atom, a nitro group or a divalent unsaturated group forming a condensation ring structure, and m and n each denotes 0 or an integer of 1 to 4, in an amount of 0.01 to 0.3 weight % relative to polymerizable compound (a), (d) a reducing agent in an amount of 0.1 to 5 weight % relative to polymerizable compound (a), and (e) a filler.