Evaluation of shear strength of lingual brackets bonded to ceramic surfaces

Admin Dental Press

Edition V16N03 | Year 2011 | Editorial Original Article | Pages 87 to 94

Michele Balestrin Imakami , Karyna Martins Valle-corotti , Paulo Eduardo Guedes Carvalho , Ana Carla Raphaelli Nahás Scocate

Objectives: 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. Conclusions: 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.

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