Effect of different tooth surface conditioning techniques on shear bond strength of orthodontic brackets

Document Type : Original Article

Authors

1 Department of Orthodontics, Faculty of Dentistry, Alexandria University

2 Department of biomaterials, Faculty of Dentistry, Alexandria University

Abstract

Background: The aim of this study was to test, in v Background: ivo, the effect of using warm air for drying the tooth surface after conditioning, on the shear bond strength of orthodontic brackets. This shear bond strength was also compared to the shear bond strength of brackets after different tooth surface conditioning techniques with compressed air from 3-way syringe for drying etched enamel. Methods: eighty sound premolar teeth were Methods: divided into four groups (20 into each group). According to the methods used, brackets (mini 2000) were bonded after enamel preparation with acid etch (control), pumice prophylaxis+acid etch, pumice+sandblasting 50 microns+acid etch, pumice+sandblasting+acid etch+warm air. The teeth were mounted in metallic mold using a mounting jig to align their labial surfaces with the bonded brackets to be parallel to the applied force during the shear bond strength testing. Also after debonding, the amount of resin remaining on each tooth was evaluated. Results: there was a statistically significant diff Results: erence among the four groups increased with the following sequence; group B showed the significantly lowest shear bond strength values, then the control group, followed by group C and finally group D showed the significantly highest values. Adhesive remnant index (ARI) evaluation indicated higher frequency in group A, C and D, if compared to group B. Conclusion: complete enamel preparation Conclusion: with pumice prophylaxis, followed by sandblasting, acid etch and warm air drying significantly improved shear bond strength.

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