Introduction: The purpose of this study was to evaluate and compare the effectiveness of different anti-oxidizing agents (sodium ascorbate, rosemary extract) on the shear bond strength of brackets bonded to human enamel after bleaching with carbamide peroxide (CP).
Methods: Eighty recently extracted maxillary first premolars were divided into four groups. Specimens in Group I (control) (n=20) were bonded without bleaching; specimens in Group II (n=20) were bleached and bonded Group III and Group IV specimens (n=20 each) were bleached, and then treated with 10% sodium ascorbate and rosemary extract respectively before bonding. The specimens were debonded, and the enamel surfaces and bracket bases were examined with a stereomicroscope. The adhesive remnant index was used to assess the amount of resin left on the enamel surfaces after debonding. The shear bond strength data were subjected to 1-way analysis of variance. Multiple comparisons were performed with the Bonferroni test. The level of significance was established at P <0.05 for all statistical tests.
Results: The shear bond strength of brackets bonded immediately after bleaching with 10% CP was significantly lower than that of brackets bonded to unbleached enamel (P<0.001). No statistically significant differences in shear bond strength were noted when the sodium ascorbate and rosemary extract treated groups were compared with the control group (P = 1.00).
Conclusions: Bleaching with 10% CP immediately before bonding results in the reduction of bracket shear bond strength. Treatment of bleached samples with 10% sodium ascorbate solution and rosemary extract reversed the reduced shear bond strength of brackets and could be an alternative to delayed bonding.
Impact Factor
2022: 6.012
This work is licensed under a