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Table 3 Comparison of ΔE values and Color change using CIEDE2000 formula, with data from the Vita Easyshade spectrophotometer measurements at different times expressed as mean and SD

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 ΔE Color change by ΔCIEDE2000
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 8.67 ± 2.61 5.59 ± 3.41 0.000 5.10 ± 1.57 3.22 ± 1.90 0.000
Baseline vs. 1-mth after bleaching 9.05 ± 2.74 5.08 ± 2.11 0.000 5.37 ± 1.61 2.94 ± 1.15 0.000
Baseline vs. 6-mths after bleaching 8.01 ± 2.84 5.07 ± 2.98 0.001 4.73 ± 1.59 2.87 ± 1.61 0.000
Baseline vs. 12-mths after bleaching 8.37 ± 2.73** 5.27 ± 2.53** 0.000 4.92 ± 1.55** 3.07 ± 1.36** 0.000
  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)