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Table 2 Comparison of ΔSGU values by Vita Classic guide and Vita Bleach Guide 3D-Master at different times. The median, minimum and maximum values are shown

From: The change of teeth color, whiteness variations and its psychosocial and self-perception effects when using low vs. high concentration bleaching gels: a one-year follow-up

Assessment points Color change by ΔSGU Vita Classical Color change by ΔSGU Vita Bleachguide
37.5% Hydrogen Peroxide 6% Hydrogen Peroxide Mann-Whitney test* 37.5% Hydrogen Peroxide 6% Hydrogen Peroxide Mann-Whitney test*
Baseline vs. 1-wk after bleaching 7 (2:9) 6 (2:9) 0.205 3.5 (1:6) 3 (2:6) 0.156
Baseline vs. 1-mth after bleaching 7 (2:9) 6 (1:9) 0.054 3 (1:6) 2 (0:5) 0.040
Baseline vs. 6-mths after bleaching 7 (3:8) 6 (1:8) 0.055 3 (2:5) 2 (0:4) 0.004
Baseline vs. 12-mths after bleaching 6 (1:8)** 5 (0:7)** 0.033 3 (0:5)** 2 (0:4)** 0.002
  1. * for comparison between both groups in each assessment time; ** for comparison between two assessment time (1-month vs 12-month after bleaching) in each group. No significant difference was found (Wilcoxon test; p > 0.05).** for comparison between two assessment time (1-month vs 12-month after bleaching) in each group. No significant difference was found (Student t test for paired sample; p > 0.05)