Triple-blinded randomized clinical trial comparing efficacy and tooth sensitivity of in-office and at-home bleaching techniquesObjective: Our study aims to compare the efficacy and tooth sensitivity following in-office (35% hydrogen peroxide) or at-home (10% carbamide peroxide) bleaching treatments both preceded by 2% potassium nitrate (2%KF) desensitizing gel. Methodology: 130 volunteers were randomly allocated to a) in-office bleaching and a placebo at-home protocol; or b) in-office placebo and at-home bleaching treatment. 2% KF was applied for 10 min before both treatments. Objective: color evaluation was performed (spectrophotometer CIEL*a*b* system and CIEDE2000) to calculate the color change (ΔE00). Subjective evaluation was performed using the VITA classical shade guide followed by shade variation (ΔSGU) at the beginning and end of bleaching treatment and 2 weeks post-bleaching. Tooth sensitivity was daily recorded using a Likert scale varying from 1 (no sensitivity) to 5 (severe sensitivity). Analysis was carried out using non-parametric tests.Results: Regarding the color change, at-home bleaching resulted in significant color improvement compared to in-office treatment for the parameters Δb* (p=0.003) and Δa* (p=0.014). Two weeks post-bleaching, the at-home treatment resulted in significant color improvement compared to in-office treatment for the parameters Δb* (p=0.037) and ΔE00 (p=0.033). No differences were observed in either ΔSGU parameters. Concerning sensitivity, patients treated with in-office bleaching reported more tooth sensitivity than the at-home group only on the first day after bleaching started, without significant differences in the other periods evaluated (p>0.05). Conclusions: At-home and in-office bleaching, preceded by a desensitizing agent, were effective for vital teeth bleaching and 10% carbamide peroxide produced a higher whitening effect than 35% hydrogen peroxide in the short time evaluation. Tooth sensitivity rates were similar for the two techniques tested.

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Objective: To estimate malocclusion prevalence, severity, treatment needs and selfperception in a group of students. Material and Methods: This cross-sectional study was carried out with 50 students aged 12 years who attended a public school in the municipality of Tapejara, Brazil in 2012. Oral exam concerning malocclusion was performed by a single dentist (Dental Aesthetic Index) and a questionnaire about selfperception was applied. Data were presented in the form of descriptive analysis. Results: Prevalence of malocclusion was observed in 98% of students, and maxillary overjet was the most frequent malocclusion. According to the DAI index, 52% of students had indication for orthodontic treatment, and of these, 22% were considered severe or disabling malocclusion. Regarding the self-perception of adolescents about their oral health status, 86% of respondents reported the desire to use orthodontic appliance. Conclusion:The results demonstrated that malocclusion prevailed over normal occlusion. However, the perception of adolescents was higher compared to normative criteria. This suggests that small malocclusion problems are quickly perceived by adolescents.