Shear bond strength of ceramic brackets after different pre-treatments in porcelain surface

ABSTRACT

To evaluate the bond strength of brackets bonded after different surface treatments on two dental ceramics. METHODS: One hundred and twenty discs 5 mm thick and 7 mm diameter of two ceramic types were made and randomly divided in 8 groups. Groups 1, 3, 5, and 7 used Eris ceramic and groups 2, 4, 6, and 8 used d.Sign ceramic. The ceramic surfaces were treated with 10% hydrofluoric acid G1 and G2, 10% hydrofluoric acid + silane G3 and G4, aluminum oxide blasting + 35% phosphoric acid + silane G5 and G6, CoJet blasting + 35% phosphoric acid + silane G7 and G8. Metallic brackets were cemented with Concise cement. Mechanical test was performed in a universal testing machine until failure. RESULTS: The average values MPa obtained G1 - 7.30; G2 - 6.12; G3 - 17.49; G4 - 19.54; G5 - 18.80; G6 - 21.93; G7 - 6.81 e G8 - 9.77 were submitted to ANOVA and Tukey test p<0.05. The fracture patterns were analyzed in stereoscopic microscope 25´X and representative samples of each group were analyzed in SEM. CONCLUSIONS: It was possible to conclude that use of silane after hydrofluoric acid increased the bond strength values...