Abstract
Abstract Introduction patients have been submitted to tooth bleaching during orthodontic treatment for aesthetic purposes or to anticipate the replacement of restorations after completion of the treatment. Objective to evaluate the effectiveness of tooth bleaching under orthodontic brackets bonded with different materials. Material and method a hundred bovine enamel blocks were divided into two groups, at-home and in-office tooth bleaching. In-office bleaching was subdivided into five groups (n = 10): HP (control - without brackets); SA(t) - brackets bonded with Transbond XT, without bleaching; SA(fm) - brackets bonded with Orthodontic Fill Magic, without bleaching; HP(t) - brackets bonded with Transbond XT subjected to bleaching; and HP(fm) - brackets bonded with Orthodontic Fill Magic subjected to bleaching. At-home bleaching followed the same treatments, only replacing the bleaching agent. Spectrophotometric assessment was used for tooth color determination at three moments: 1) before staining (baseline); 2) after staining; 3) after bonding the brackets and bleaching procedures. Data were submitted to ANOVA and analyzed by Tukey's test (p < 0.05). Result For both types of bleaching, the control group had an effective bleaching action. Groups using Transbond XT presented greater bleaching potential among the groups with orthodontic accessory, but the bleaching action differed from the positive control. Groups using Orthodontic Fill Magic presented no bleaching action, resembling the negative control groups (artificial saliva). Conclusion the orthodontic bracket impaired the effectiveness of the at-home and in-office bleaching treatment, regardless of the resin used for bonding.
Highlights
One of the reasons of discontentment among orthodontic patients is the enamel color change that occurs during treatment[1,2]
In order to address these questions, the present study aimed to evaluate through reflectance spectrophotometry the effectiveness of tooth whitening under orthodontic brackets bonded with different materials
HP(t) and without brackets (HP)(t) - brackets bonded with Transbond XT subjected to bleaching; 5
Summary
One of the reasons of discontentment among orthodontic patients is the enamel color change that occurs during treatment[1,2]. The mechanism of action of tooth whitening involves an oxidation‐reduction reaction where the hydrogen peroxide reduces organic pigments impregnated in the enamel and dentin, allowing their elimination. When hydrogen peroxide gets in contact with the enamel surface, it releases unstable oxygen, which binds to other substances that are free or weakly bound to a particular substrate, for stabilization[5]. Dental enamel is a highly mineralized crystalline tissue that presents some permeability, allowing the diffusion of substances and the ionic exchange with the buccal environment[6]. Tooth whitening is only possible because of this permeability and the low molecular weight of some active chemical components of bleaching agents, such as hydrogen peroxide[7]
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