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

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

Assessment points	Color change by ΔSGU Vita Classical			Color change by ΔSGU Vita Bleachguide
Assessment points	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

* 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)

ISSN: 1472-6831