Efeito de diferentes tratamentos pré e pós-sinterização de superfície sobre infraestruturas em zircônia: avaliação da resistência de união ao cimento resinoso

Abstract

The modified ceramic by zirconium dioxide in the TZP form has been preferred for making extensive fixed prosthesis for their increased mechanical properties mainly flexural strength. However, the biomechanical behavior of the modified ceramic surface has been shown to be inert to chemical conditioning for subsequent adhesive cementation with resin luting cement. The objective of this study was to evaluate the effect of different zirconia surface treatments on the shear bond strength to resin cement. Sixteen zirconia samples were made and randomly divided into 8 groups according to surface treatment: Group I - control (no preparation); GII - grinding with diamond tip 3101G (KG Soresen); GIII – sandblasted with glass sphere; GIV - M5 milling with 5 + 1 (GAIS), average roughness; GV - Control + primer Monobond plus; GVI - Same as group II + primer Monobond plus; GVII - Same as group III + primer Monobond plus; GVIII Same as group IV + primer Monobond plus. Data were submitted to analysis of variance and Kruskal-Wallis test (p = 0.05). GII showed the best results and Monobond plus average values increased about 100%, with statistically significant differences from other groups. GI, GIII and GIV showed no statistically significant differences between them, as well as the comparison of these after applying Monobond plus. GIII had significant differences when compared to GVII. According to the methodology, it was concluded that the manual mechanical preparation with diamond tip associated with the chemical etching with Monobond plus significantly improved bond strength between ceramic and resin cement RelyX U200 (3M ESPE).