Evaluation of shear bond strength of orthodontic brackets bonded on the tooth surface after internal bleaching

Nadia De Souza Ferreira,Marcia Carneiro Valera,Raffaela Di Iorio Jeronymo Ferreira,Patrícia Campos Ferreira Da Rosa

doi:10.1590/rou.2014.033

Nadia De Souza Ferreira, Marcia Carneiro Valera + Show 2 more

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https://doi.org/10.1590/rou.2014.033

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Abstract

Introduction: There is great demand for esthetic treatment by patients who have discolored teeth, because currently aesthetic standards have become stricter and many patients have tooth bleaching procedures performed before or during orthodontic treatment. Objective: To evaluate the bonding of orthodontic brackets to human molars after internal tooth bleaching. Material and method: Forty molars were divided into four groups according to the bleaching agent used: PS) sodium perborate + water; PC) carbamide peroxide; PC + PS) carbamide peroxide + sodium perborate; Cont) water (control group). Bleaching agents placed inside the pulp chambers were replaced every 7 days for 2 weeks, and the brackets were bonded 30 days after the end of bleaching. The shear strength test was performed in a universal testing machine (Emic). Result: ANOVA with a significance level of 5% (p > 0.05), showed no statistically significant difference between groups (p = 0.1214). Conclusion: It was concluded that the different bleaching agents studied did not interfere with the bond strength of brackets to enamel and bonding the brackets 30 days after internal bleaching is a safe procedure.

Highlights

There is great demand for esthetic treatment by patients who have discolored teeth, because currently aesthetic standards have become stricter and many patients have tooth bleaching procedures performed before or during orthodontic treatment
The bleaching agents most used for internal tooth bleaching are carbamide and hydrogen peroxide, and sodium perborate[3,4,5,6]
The aim of this study was to determine the shear bond strength of orthodontic brackets bonded to the dentin surface of molars, 30 days after internal bleaching performed with different bleaching agents

Summary

Introduction

There is great demand for esthetic treatment by patients who have discolored teeth, because currently aesthetic standards have become stricter and many patients have tooth bleaching procedures performed before or during orthodontic treatment. Objective: To evaluate the bonding of orthodontic brackets to human molars after internal tooth bleaching. Conclusion: It was concluded that the different bleaching agents studied did not interfere with the bond strength of brackets to enamel and bonding the brackets 30 days after internal bleaching is a safe procedure. Bleaching darkened teeth may avoid invasive treatments, such as prosthetic procedures that require the wear of a large quantity of dental tissue when they are performed, so that bleaching is considered a more conservative alternative, which significantly changes the appearance of the teeth and increases the patient’s self esteem[1,2]. In patients who will be submitted to orthodontic treatment, the prosthetic procedure should be avoided or delayed until after tooth movement has been performed. Bleaching agents promote changes in the chemical composition of the tooth[7] and may promote failures in the bond to dent and enamel[6,8]. It has been suggested that the quality of the resin composite bond to dentin may be harmed when restorations are performed immediately after bleaching treatment[9,10]

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