Shear bond resistance and enamel surface comparison after the bonding and debonding of ceramic and metallic brackets

Admin Dental Press

Edition V19N01 | Year 2014 | Editorial Original Article | Pages 77 to 85

Osé Maurício Da Rocha , Marco Abdo Gravina , Marcio José Da Silva Campos , Cátia Cardoso Abdo Quintão , Carlos Nelson Elias , Robert Willer Farinazzo Vitral

Objective: To evaluate, in vitro, the shear bond strength presented by three brands of polycrystalline ceramic brackets and one brand of metallic bracket; verify the adhesive remnant index (ARI) after the tests, and analyze, through scanning electron microscopy (SEM) the enamel surface topography after debonding, detecting the release of mineral particles. Methods: Sixty bovine lower incisors were used. Three ceramic brackets (Allure®, InVu®, and Clarity®) and one metallic bracket (Geneus®) were bonded with Transbond XT®. Kruskal-Wallis’s test (significance level set at 5%) was applied to the results of shear bond and ARI. Mann Whitney’s test was performed to compare the pairs of brackets in relation to their ARI. Brown-Forsythe’s test (significance level set at 5%) was applied to the results of enamel chemical composition. Comparisons between groups were made with Games-Howell’s and the Post-hoc tests. Results: No statistically significant difference was observed in relation to the shear bond strength loads. Clarity® brackets were the most affected in relation to the surface topography and to the release of mineral particles of enamel (calcium ions). Conclusion: With regard to the ARI, there was a prevalence of score 4 (40.4%). As for enamel surface topography, the Geneus® bracket was the only one which did not show superficial tissue loss. The InVu® and Clarity® ones showed cohesive fractures in 33.3% and the Allure® in 50%, the latter being the one that presented most fractures during removal.

Shear bond strength, Tooth enamel, Orthodontic brackets, Scanning electron microscopy,

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