Objectives: The aim of this study was to evaluate the microtensile bond strength between a resin composite (W3D- Master – Vita Zahnfabrik ) and Vitadur Alpha Ceramic (Vita Zahnfabrik) submitted to three different surfaces treatments using the microtensile bond strength test. Methods: Nine ceramic blocks (6mmx6mmx6mm) were made and divided randon in three groups, in agreement with the surface treatment ;G1: sandblasting with aluminum oxide particles (110µm) ; G2: sandblasting with hidrofluoric acid 10%; G3: sandblasting with Cojet System. After the treatment of the ceramic surface, it was applied the Single Bond (3M) adhesive system following removal of the excesses and cure (XL 3000- 3M), the resin composite was condensed and cured in layers of 2mm , to form a block of 6mm height. After the storage period ( in distilled water at 37⁰C) the ceramic/resin blocks were seccionated in samples . In each group ( 1,2 and 3) ther were 25 samples (10mmx1mmx1mm),the adhesive area was 1mm²± 0.1 mm². The samples were submitted to the microtensile bond strength test in a universal testing machine (EMIC) with a crosshead speed of 0.5mm/min and a load cell of 10Kgf until fracture. Results: An exploratory data analysis was performed to determine the most appropriate statistical test. Descriptive statistics data (Mpa) for Cojet system (mean±standard deviation: 9.99± 2.48; median 10.32), for hidrofluoric acid 10% (8.82±2.40; 8.31) and for Al2O3 (9.82±2.97; 9.13) were submitted to Kruskal- Wallis test.Results tests showed that the sandblasting medians did not differ statistically (statistical test kw= 2.41; df= 2; p-value= 0.299).Conclusions: according to the methodology used and the results obtained, its possible to conclude that the three surface treatment used in this study was efficient for an intraoral porcelain repair.

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