Shear Bond Strength of different accessories used to traction impacted teeth

Abstract

To evaluate the shear bond strength and the adhesive remnant index (ARI) of different orthodontic accessories used for applying traction on impacted teeth. Methods: 120 bovine incisors were used. Initially, all teeth were submitted to prophylaxis, subsequent etching with 37% phosphoric acid, application of adhesive and light polymerization. Afterwards, these teeth were randomly divided into eight groups: (1) composite lingual button; (2) hook for application of traction on impacted teeth; (3) hook with chain; (4) cleat; (5) brackets; (6) convex lingual button; (7) concave lingual button; and (8) orthodontic mesh. The groups were submitted to shear tests in a universal test machine, and ARI evaluation. Results: The group of orthodontic mesh (8) presented the best shear bond strength results with statistically significant differences comparing with the composite lingual button (p<0.001), hooks for application of traction on impacted teeth (p=0.002), hooks with chain (p=0.001), cleat (p=0.011), brackets (p< 0.001), convex lingual button (p=0.003) and convex lingual button (p<0.001). The highest mean ARI values were also obtained for the mesh group, with statistically significant differences comparing with the composite lingual button (p=0.008), cleat (p=0.004), brackets (p=0.001), convex lingual button (p=0.017) and concave lingual button (p=0.005). Conclusion: The greatest adhesion forces were obtained with the orthodontic mesh, which was statistically different from all other groups, and the lowest adhesion forces with the