Three different mixed silanes, (1) 3-mercaptopropyltrimethoxysilane (3-SH) and 3-methacryloxypropyltrimethoxysilane (3-MPS), (2) 3-SH, 3-MPS and 1, 6-bis(trimethoxysilyl)hexane, (3) 3-SH and N, N-bis(3-trimethoxysilylpropyl)methacrylamide, were used as primers for adhesion of poly(methyl methacrylate) to various dental precious metal alloys, base metal alloys and porcelain teeth.
After the thermo-cycle test, the bond strengths of precious metal alloys and porcelain teeth specimens treated with 3-SH/3-MPS primer were excellent. All 3-SH mixed primers to Ag alloy showed better water-resistance adhesion. There was no effect of three mixed primers on base metal alloy specimens.