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Dental Press Journal of Orthodontics
versão On-line ISSN 2176-9451
IMAKAMI, Michele Balestrin; VALLE-COROTTI, Karyna Martins; CARVALHO, Paulo Eduardo Guedes e SCOCATE, Ana Carla Raphaelli Nahás. Evaluation of shear strength of lingual brackets bonded to ceramic surfaces. Dental Press J. Orthod. [online]. 2011, vol.16, n.3, pp. 87-94. ISSN 2176-9451. http://dx.doi.org/10.1590/S2176-94512011000300011.
OBJECTIVE: The aim of this study was to evaluate the shear strength of lingual metal brackets (American Orthodontics) bonded to ceramic veneers. METHODS: A total of 40 specimens were divided into four groups of 10, according to bonding material and ceramics preparation: Group I -Sondhi Rapid-Set resin and Hydrofluoric acid, Group II -Sondhi Rapid-Set resin and aluminum oxide, Group III -Transbond XT resin and Hydrofluoric acid, and Group IV -Transbond XT resin and aluminum oxide. Prior to bonding, the brackets were prepared with heavy-duty resin base (Z-250) and the ceramic veneers were treated with silane. The shear test was conducted with a Kratos testing machine at a speed of 0.5 mm/min. RESULTS: The results were statistically analyzed by the Tukey test (p<0.05) and showed a statistically significant difference between groups I (2.77 MPa) and IV (6.00 MPa), and between groups III (3.33 MPa) and IV. CONCLUSION: In conclusion, the bonding of lingual brackets to ceramic surfaces exhibited greater shear strength when aluminum oxide was used in association with the two resins utilized in this study, although Transbond XT showed greater shear strength than Sondhi Rapid-Set.
Palavras-chave : Bonding; Ceramic surface; Orthodontics; Lingual brackets.