Figure 2 Mean rank values www.selleckchem.com/products/tofacitinib-cp-690550.html of ��E associated with the two bleaching methods. (Note: ��E1 = Bleaching effectiveness; ��E2 = Rebound effect; ��E3 = Color difference between post-treatment and unbleached teeth) Table 1 Mean (SD) values of ��E associated with the two bleaching methods The difference between the bleaching methods immediately after bleaching, then at 2 weeks, 1 month, 3 month and 6 month follow-up periods was compared using the Mann-Whitney test. Between groups, the bleaching effectiveness (��E1) and rebound effect (��E2) and ��E3 were compared using the Mann-Whitney test because of non-matching data comparison between the two groups. The Friedman test was used to identify differences among ��E1, ��E2 and ��E3 for each bleaching technique that was indicated for matching comparisons among three or more groups.

The Wilcoxon test was done as the Friedman test showed some difference between ��E1, ��E2 and ��E3 for each bleaching technique. The Wilcoxon is indicated for matching comparisons between only two groups. The distribution of tooth sensitivity for comparing both methods and jaws was evaluated using the Chi-square test (�� =0.05), that was indicated for qualitative data, for a non-matching comparison between two groups. RESULTS Eight participants from the power bleaching phase and six from the at-home bleaching phase complained about tooth sensitivity after treatment. Two of them experienced sensitivity after both treatment methods. Three participants were dissatisfied with the taste of the at-home bleaching agent. Nonetheless, all were able to complete the bleaching intervals successfully.

It should be noted that there was no significant difference between both bleaching methods immediately after bleaching, or at the 2 week, 1 month and 3 month follow-up periods. (P > 0.05 Mann-Whitney). The only statistic significant difference between the two bleaching methods was found in ��E2 (P = 0.001 < 0.05, Mann-Whitney) and at the 6 months follow-up period suggesting that the Dacomitinib rebound effect in power bleaching method was significantly faster than that of at-home bleaching after 6 months. In both groups, there was no significant difference between ��E1 and ��E3 (home bleach = 0.59 > 0.05 and office bleach = 0.069 > 0.05 Wilcoxon). The Chi-square test showed that post-treatment sensitivity was identical (P > 0.05) for both methods [Figure 3]. Figure 3 Prevalence of sensitivity with each bleaching method DISCUSSION The aim of this clinical trial was to address practitioner concerns regarding the efficacy, longevity and degree of hypersensitivity of bleached teeth after in-office vital bleaching compared with at-home bleaching techniques.