Resumo

VALANDRO, Luiz Felipe; MALLMANN, André; DELLA BONA, Alvaro  e  BOTTINO, Marco Antonio. Bonding to densely sintered alumina- and glass infiltrated aluminum / zirconium-based ceramics. J. Appl. Oral Sci. [online]. 2005, vol.13, n.1, pp. 47-52. ISSN 1678-7757.  http://dx.doi.org/10.1590/S1678-77572005000100010.

The objective of this study was to test two hypotheses: (1) silica coating affects the bond strength between ceramics and a resin cement; (2) bond strength is affected by the type of ceramic. Twelve blocks 5 x 6 x 8 mm of In-Ceram Zirconia (ZR) and twelve Procera AllCeram (PR) ceramics were made and duplicated in composite. Five blocks of each ceramic were treated as follows: (1) ZR + GB (laboratorial airborne particles abrasion with Al₂O₃ particles) + silane; (2) ZR + SC (chairside tribochemical silica coating system, Cojet); (3) PR + GB; (4) PR + SC. Two treated samples of ceramic were analyzed under SEM. The ceramic-composite blocks were cemented with Panavia F and stored in 37ºC distilled water for 7 days. They were then cut to produce bar specimens (n=30) with a bonding area of 0.6±0.1mm². Specimens were loaded to failure under tension in a universal testing machine (1 mm/min). Bond strength (s) values were statistically analyzed using ANOVA (Two-way) and Tukey (a = 0.05). Mean s (MPa) and standard deviation were as follows: 1) 15.1 ± 5.3; 2) 26.8 ± 7.4; 3) 12.7 ± 2.6; 4) 18.5 ± 4.7. Silica coated surfaces showed statistically higher s than the same substrate treated with GB only. In addition, ZR (with vitreous phase) showed higher ó than PR (without vitreous phase).

Palavras-chave : Ceramics; Surface treatment; Bond strength; Microtensile test.