Due to the great demand and popularization of dental bleaching, several technologies have been used to improve results of dental bleaching and reduce adverse effects on dental structure, among them, the LED emitting violet light. Thus, the aim of this study will be evaluate the color stability of dental enamel bleached with Violet Led System, associated or not to low concentration of whitening agent gels, on teeth stained with black tea. The sample will be composed of 72 bovine incisors that do not present alterations of enamel. They will be sectioned into fragments and submitted to extrinsic stain with black tea. Subsequently they will be divided into 6 groups (n = 12) according to the dental bleaching technique: GI - Bleaching with Violet Led System; GII - Bleaching with 7.5% hydrogen peroxide; GIII- Bleaching with 7.5% hydrogen peroxide + Violet Led System; GIV - Bleaching with 22% carbamide peroxide; GV- Bleaching with 22% carbamide peroxide + Violet Led System; GVI- Without bleaching. The response variable will be color change analysis, evaluated by a spectrophotometer. Three color readings will be performed: initial, after staining (black tea) and after the whitening techniques. The data obtained will be submitted to statistical analysis.
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