Orthodontic Brackets made by MIM Technologic: Debonnding Forces Analysis

Aim: To compare three types of brackets with a control group to assess their mechanical retention on the enamel. Materials and methods: Atotal of 81 bovine teeth, preserved in Thymol 0,1%, were random divided into 4 groups, each of 20 teeth. After the standard procedures of adhesion, there were applied different brackets for each group: G1: Discovery, G2: Extremo, G3: Mini Dyna-Lock, G4: D.B. (G1,G2,G3 were MIM technologic while G4 was Mesh). Detachment was conducted by Instron Universal Testing Machine and Kruskal Wallis test was used for statistical analysis while ARI for the clinical. Results: There were statistically significant differences among the three groups and the control one (P<0,05): G4 indeed produced the highest detachment forces while there were no differences among the MIM groups, whose forces were similar. Conclusion: Detachment forces of brackets made with MIM technology are not different from each other, but were significantly lower than those obtained with conventional brackets with mesh.