セラミックス用市販接着システムの歯科用ジルコニアに対する接着耐久性

Abstract

This study investigated the effects of silanation and adhesive monomer, 10-methacryloyloxydecyl dihydrogen phosphate (MDP), on the bond durability of resin cement to zirconia. Two sizes of zirconia disk were prepared. The bonding surfaces of the disks were air-particle abraded with 50 microm Al2O3, and then bonded with one MDP-containing or three non-MDP-containing cements to fabricate test specimens. For the silanated specimen group, air-particle abraded surfaces were treated with respective silane coupling agents, including two MDP-containing or two non-MDP-containing agents, before the bonding procedure. Five test specimens for each group were subjected to thermo-cycles before shear bond strengths were determined. The data were statistically analyzed. For test groups without silanation, the specimens bonded with MDP-containing resin cement showed significantly higher bond strength. In contrast, all specimens bonded with non-MDP-containing resin cements failed during the thermo-cycling process. For the silanated groups, the specimens pre-treated with MDP-containing silane coupling agent and bonded with non-MDP-containing resin cement exhibited the highest shear bond strength. The shear bond strength of specimens pre-treated with MDP-containing silane coupling agent and bonded with MDP-containing resin cement was the next highest. In contrast, all specimens pre-treated with non-MDP-containing silane coupling agent bonded with non-MDP-containing resin cements failed during the thermo-cycling process. Within the limitations of this study, MDP adhesion monomer was effective in improving the bond durability of resin cement to zirconia.