Objectives:In this study was evaluated the bond durability of a composite resin for repair to an alumina reinforced ceramic , submitted to 2 different surfaces treatments. Methods:There were made 32 ceramic blocks (Vitadur-á)(5x5x5mm), as recommended by manufacturer, that were randomly separated into 2 groups, considering the surface treatment (ST): (ST-1) Silica sandblasting with 30ìm particles (CoJet – Sand) + silane (ESPE-Sil); (TS-2) Conditioning with fluoric acid 10%1m + silane (ESPE-Sil). Further on mono-component adhesive (Single Bond, 3M-Espe) on the ceramic surface and 3 layers of a composite resin measuring ± 1,5 mm (W3D Master, Wilcos) were applied. The samples were sectioned in the x and y axis, resulting in 10 specimens (sp) per ceramics block (adhesive area of ± 1mm²). The sp of each block were divided into 2 subgroups, according to the storage. Four experimentals groups (n=8) were obtained: G1) ST-1 + immediate essay [IE]; G2) ST-1 + thermocycling (6000 cycles, 5°-55°C) [TC]; G3) ST-2 + IE; G4) ST-2 + TC. Each sp were fixed with cyanoacrylate on adapted caliper, and the tensile test was performed (1mm/min). Results: The obtained data (Mpa) were evaluated by 2 way ANOVA and Tukey (á=0.05). G1 (12,30±2,93a), G2 (14,47±2,22a) and G4 (12,08±1,89a) presented bond durability statistically similar among G1, G2 and G4, which were lowest than G3 (19,80±2,28b) (p<0,001). The surface treatments were similar among G1,G2 and G4 (p=0,061). The thermocycling reduced the bond durability in ST-2 (p=0,041). Conclusion: The silica coating and acid conditioning showed similar bond strength.

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