Abstract
Objective: The aim of this study was to evaluate the effects of material and processing methods on the bondstrength of orthodontic brackets. Material and Methods: Five types of brackets were tested: Conventionalmetallic (CM), metallic sandblasted (SB), ceramic (C), polycarbonate (PC), and metallic fabricated by meltinginjection molding (MIM). Shear bond strength (SBS) was conducted to check bond strength of the bracketsbonded to bovine teeth (n=10/group), and tensile bond strength (TBS) (20 brackets/group) to check bracketretention to bonding material (n=20/group). Both, SBS and TBS were conducted with 1mm/min crossheadspeed in a universal testing machine. Bond strength was calculated in Megapascal (MPa) based on force (N) andbracket area (mm2). Data normality was verified, and One-way ANOVA was the statistical test with Tukey posthoc(a=0.05). Results: SB and MIM presented higher SBS compared to C, PC, and CM (p<0.05). SB and MIMalso presented significantly higher TBS compared to CM and PC (p<0.05). However, MIM was not different ofC for TBS. Conclusion: The type of material and method of fabrication are determinant factors that affect bondstrength of orthodontic brackets and melting injection molding (MIM) is a remarkable technology to improvebrackets retention during the orthodontic treatment. KEYWORDSBond strength; Orthodontic brackets; Melting injection molding.
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