Long-term Clinical Evaluation of In-office Dental Bleaching Using a Violet Light (405-410 nm)

The objective of this clinical study is to evaluate the effect of the whitening treatment performed with the violet LED light (405-410 nm), with or without a bleaching gel, on the tooth color changes (immediate and long-term), tooth sensitivity, satisfaction of participants in relation to the technique and impact on their quality of life. After being informed of the objectives of the study, 200 participants will be selected and randomly divided into a treatment group (n = 25): G1 - 35% hydrogen peroxide (HP) (4 sessions, 1 session/week); G2 - 30% carbamide peroxide (CP) (4 sessions, 1 session/week); G3 - Violet LED (405-410 nm, 4 sessions, 1 session/week); G4 - Violet LED (405-410 nm, 4 sessions, 2 sessions/week); G5 - Violet LED associated to 35% hydrogen peroxide (4 sessions, 1 session / week); G6 - Violet LED associated to 30% carbamide peroxide (4 sessions, 1 session / week); G7 - hybrid technique HP (Violet LED + application of 35% hydrogen peroxide + violet LED) (4 sessions, 1 session/week); G8 - Hybrid technique CP HP (Violet LED + application of 30% carbamide peroxide + violet LED) (4 sessions, 1 session/week). The color evaluation will be performed at predetermined times (before and immediately after treatment, 14 days after completion of bleaching and 3, 6 and 12 months after completion of bleaching), and quantitatively evaluated by colorimetric tests (objective and subjective) and spectrophotometry. In addition, it will be evaluated the tooth sensitivity during and after (48 hours) tooth whitening (VAS Scale), satisfaction with the treatment and impact on quality of life (OHIP-14 questionnaire). The data, except for survey data of satisfaction (descriptive evaluation), will be subjected to statistical analysis to determine the homogeneity and normality of the sample and for comparison between treatment groups, considering a 5% significance level.