Objective: To evaluate effects of dehydration on tooth color determine whether color returns to baseline after 30 min or 24 h.
Materials and methods: Thirty participants with intact maxillary central and lateral incisors were recruited for the study. Color measurements were performed with a spectrophotometer (SpectroShade Micro) at baseline and at 10, 20, and 30 min of dehydration, as well as 30 min and 24 h of rehydration. CIEDE2000 color parameters were used to calculate color difference. The data were analyzed for color changes over time by repeated-measures analysis of variance (ANOVA), and the Bonferroni-Tukey test was used for post-ANOVA comparisons (P < .05).
Results: After 30 min of dehydration, all the tested teeth were above the perceptibility threshold (ΔE00 = 0.8), and 85% of the teeth were above the acceptability threshold (ΔE00 = 1.8). After 30 min of rehydration, 78.3% of the tested teeth were above the perceptibility threshold, and 31.6% of the teeth were above the acceptability threshold. After 24 h of rehydration, 99.2% of the teeth were below the acceptability threshold, and 90% of the values were below the perceptibility threshold.
Conclusions: Thirty-minute tooth dehydration can result in a clinically significant color change. After a 24-h rehydration period, reliable color assessment can be performed.
Clinical significance: Tooth dehydration causes significant color change, thus assessment of final color or clinical success should be considered after tooth rehydration for esthetic restorations and tooth bleaching.
Keywords: color change; in office tooth whitening; tooth color; tooth dehydration; tooth isolation.
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