Patent ID: 8158694

Claim:
A method of improving the adhesion of a porcelain, alumina or zirconia, comprising coating a surface of the porcelain, alumina or zirconia with a one-component dental primer comprising (a) a silane coupling agent, (b) an acidic group-containing polymerizable monomer, and (c) a volatile organic solvent, wherein the primer comprises 1 to 60 parts by weight of (a) the silane coupling agent, 1.0 to 20.0 parts by weight based on 100 parts by weight of the (a) component of (b) the acidic group-containing polymerizable monomer, and 28 to 99 parts by weight of (c) the volatile organic solvent, and wherein (b) the acidic group-containing polymerizable monomer is a phosphonic acid group-containing (meth)acrylate monomer, and the phosphonic acid group-containing (meth)acrylate monomer is represented by the following formula [1]: wherein R 1 denotes a hydrogen atom or a methyl group, R 2 denotes an alkylene group of a carbon atom number of 1 to 20 optionally having a substituent, and R 3 denotes an alkylene group of a carbon atom number of 1 to 15 optionally having a substituent.