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Retention is one of the major factors deciding the success and longevity of resin bonded restorations. The purpose of this study was to find a better resin cement and metal surface treatment method that would enhance the bonding strength. The bonding surfaces of Verabond, one of Ni-Cr-Be alloys, were treated with sandblasting (Group 1), sandblasting and EZ-Oxisor(Group 2), sandblasting and silicoating(Group 3), and than thay were bonded with All-Bond C & B, Panavia 21 and Superbond C & B. The specimens were thermocycled, and the tensile bond strength was measured using the universal testing machine. Also the mode of bond failure was observed. @ES The results were as follows. @EN 1. The Superbond C & B showed the highest bond strength among the three resin cements and decreased in the order of Panavia 21, All Bond C & B. There was significant difference among them(p<0.05). 2. Group 3 showed the highest bond strength among the three metal surface treatment methods, and there was significant difference compared with Group 1 and Group 2(p<0.05). But there was no significant difference between Group 1 and Group 2. 3. Observing the mode of bond failure, Superbond C & B and panavia 21 showed mostly cohesive failure in all groups. All-Bond C & B showed all types of bond failure in Ground 3, but Group 1 and Group 2 showed only adhesive failure. 4. According to the results of this study, the silicoating method and 4-META containing resin cement were considered to be more acceptable for resin bonded restoration
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