Patent ID: 8785518

Claim:
A dental adhesive system comprising: a zirconia-based ceramic; and an adhesive composition applied to the surface of the zirconia-based ceramic, comprising: (a) a first acidic monomer having an ethylenically unsaturated polymerizable group of the general formula CH 2 ═CX—C(O)—R wherein X is hydrogen, methyl or a lower alkyl group, and wherein R comprises a phosphoric acid group or phosphonic acid group having the general formula —OP(O)(OH) 2 , —OP(O)(OH), —C—P(O)(OH) 2 or —C—P(O)(OH); (b) a second acidic monomer having an ethylenically unsaturated polymerizable group of the general formula CH 2 ═CX—C(O)—R 1 wherein X is hydrogen, methyl or a lower alkyl group, and wherein R 1 comprises a carboxylic acid group having the general formula —C(O)OH; (c) wherein the first acidic monomer comprises about 1% to about 5% of the dental adhesive system by weight; and (d) wherein the second acidic monomer comprises about 2% to about 10% of the dental adhesive system by weight.