This study evaluated the influence of an alternative surface treatment on the microshear bond strength (mu sbs) of zirconia-based ceramic. Thirty-five zirconia disks were assigned to five groups according to the following treatments: Control (CO), glass and silane were not applied to the zirconia...

This study evaluated the influence of an alternative surface treatment on the microshear bond strength (mu sbs) of zirconia-based ceramic. Thirty-five zirconia disks were assigned to five groups according to the following treatments: Control (CO), glass and silane were not applied to the zirconia surface; G1, air blasted with 100 mu m glass beads + glaze + silane; G2, a gel containing 15% (by weight) glass beads applied to the ceramic surface + glaze + silane; G3, a gel containing 25% (by weight) glass beads applied to the ceramic surface + glaze + silane; and G4, a gel containing 50% (by weight) glass beads applied to the ceramic surface + glaze + silane. The specimens were built up using RelyX ARC (R), according to the manufacturer's recommendations, and inserted in an elastomeric mold with an inner diameter of 0.8 mm. The mu sbs test was performed using a testing machine at a crosshead speed of 0.5 mm/min. ANOVA and Tukey's test (p < 0.05) were applied to the bond strength values (in MPa). CO (15.6 +/- 4.1) showed the lowest mu sbs value. There were no statistical differences between the G1 (24.9 +/- 7.4), G2 (24.9 +/- 2.3), G3 (35.0 +/- 10.3) and G4 (35.3 +/- 6.0) experimental groups. Those groups submitted to surface treatments with higher concentrations of glass showed a lower frequency of adhesive failures. In conclusion, the glass application improved the interaction between the ceramic and the luting cement

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