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Objective To compare the effects of 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP)- and silane-based primers with those of MDP-based primers on zirconia-resin bonding via multiple levels of aging. Methods Zirconia blocks were divided into 4 groups (n = 21) according to the primer used: MDP-based Z-Prime Plus (ZP), silane-based Monobond-S (MS), MDP- and silane-based Clearfil Ceramic Primer (CCP) and no primer (Blank). After pretreatment with or without the primers followed by bonding with cement Duo-Link, each group was subdivided into 3 subgroups (n = 7) according to aging level: 24 hours of water storage at 37 ℃ (24 h), 30 days of water storage at 37 ℃(30 d), and 30 d plus 3 000 thermal cycles (30 d/TC). After aging, shear bond strength (SBS) tests and failure mode analyses were conducted. Results ZP, MS and CCP groups had greater SBSs than did the BLANK group (PPPvs. 24 h, PPP = 0.029) but lower than that of MS at 30 d/TC (P = 0.037). From 30 d to 30 d/TC, the percent decrease in the bonding strength of ZP was significantly greater than that of MS (82.43% vs. 64.90%). Conclusion MDP-based primers function better for zirconia-resin bonding when they contain silane coupling agents. |
