[Bonding durability of commercially-available luting systems for ceramic restoration to dental zirconia].
OBJECTIVE
This study investigated the effects of silanation and adhesive monomer, 10-methacryloyloxydecyl dihydrogen phosphate (MDP), on the bond durability of resin cement to zirconia.


METHODS
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.


RESULTS
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.


CONCLUSIONS
Within the limitations of this study, MDP adhesion monomer was effective in improving the bond durability of resin cement to zirconia.
Murahara
Sadaaki
S
The Department of Fixed Prosthodontics, Kagoshima University Graduate School of Medical and Dental Science, Japan. murasada@denta.hal.kagoshima-u.ac.jp
Kajihara
Hirotada
H
Hori
Sayaka
S
Minesaki
Yoshito
Y
Onizuka
Tadashi
T
Tanaka
Takuo
T
D002516:Ceramics; D001840:Dental Bonding; D003764:Dental Materials; D008689:Methacrylates; D009943:Organophosphorus Compounds; D015040:Zirconium
D003764:Dental Materials; C074230:MDP adhesion promoting monomer; D008689:Methacrylates; D009943:Organophosphorus Compounds; D015040:Zirconium; C028541:zirconium oxide