V17N04 | 2012 | Original Article | Pages 174 to 181
Patrícia Helou Ramos Andrade, Rogério Vieira Reges, Marcos Augusto Lenza
Ceramic bracket, Composite, Shear,
Objective: To evaluate the bonding strength of the interface ceramic bracket and composite resin restoration, using four types of treatment on the base of the bracket. Methods: 48 photoactivated resin disc were used (Filtek™ Z250) contained in specimens and divided into 4 groups of 12 specimens for each group according to the type of treatment performed on the bases of the brackets. Once bonded the brackets, the specimens were subjected to shear stress carried out in a universal testing machine (MTS: 810 Material Test System) calibrated with a fixed speed of 0.5 mm / minute. The values obtained were recorded and compared by means of appropriate statistical tests (analysis of variance and then Tukey’s test). Results and conclusions: The surfaces of ceramic brackets conditioned with 10% hydrofluoric acid for 1 minute, followed by aluminum oxide blasting, 50µ, after silane application and adhesive application, was considered the best method to prepare of surfaces prior to ceramic brackets orthodontic esthetic bonding..