Objectives:The aim of this study was to evaluated the effect of different ceramic surface treatments on the tensile bond strength between the IPS Empress 2 ceramic (Ivoclar) and Rely X (3M) adhesive resin cement, with or without silane application. Methods:One hundred and twenty discs with 5.5 mm in diameter and 2.5 mm thickness were made, embedded in resin and divided in six goups: Group 1 - sandblasting for 5s with 100 µm aluminum oxide particles, without silane; Group 2 - sandblasting for 5s with 100 µm aluminum oxide particles and Ceramic Primer silane (3M) application; Group 3 - sandblasting for 5s with 50 µm aluminum oxide particles, without silane; Group 4- sandblasting for 5s with 50 µm aluminum oxide particles, with silane; Group 5- etch for 20s with 10% hyfluoridric acid, without silane; and, Group 6 - etch for 20s with 10% hyfluoridric acid, with silane. The discs were bonded into pairs with Rely X (3M) adhesive resin cement. All samples were stored in distilled water at 37°C for 24 hours and termocycled 500 times from 5°C and 55°C. After, the samples were submitted to tensile bond strength in an Instron at a crosshead speed 1.0 mm/min until failure. The data were submitted to variance analysis and Tukey's test (5%). Results:(1) with silane aplication: the Group 6 (25.36 MPa) showed tensile bond strength values significantly stronger than Group 4 (11.84 MPa) and Group 2 (8.35 MPa); the Group 4 was significantly stronger than Group 2; (2) without silane: the Group 5 (16.94 MPa) was significantly stronger than Group 3 (5.35 MPa) and Group 1 (3.80 MPa); the Group 3 was significantly stronger than Group 1.Conclusions:The ceramic etched with 10% hydrofluoridric acid and silane application increased the tensile bond strength.

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