57 - Can Smoking affect Whiteness and Color Change after At-Home Bleaching?

Abstract

To evaluate the effect of smoking on tooth whiteness and color change after at-home bleaching. The present investigation is a cohort study with 40 patients (N=40), assigned into 2 groups: NS- non-smokers (n=24) and S- smokers (n=16). At-home bleaching was performed with 22% carbamide peroxide (CP) using individual trays for 1 h a day for 14 days. CIELAB color coordinates were obtained from the six upper anterior teeth (CI- central incisors, LI- lateral Incisors and C- canines) using a Vita Easy Shade spectrophotometer before bleaching (D0-baseline), one day (D1), 15 days (D15) and one month (D30) after the end of the treatment. Whiteness index for dentistry (WID) and CIEDE2000 color difference (ΔE00) were calculated and used to evaluate the bleaching efficacy. Whiteness (ΔWID) and color (ΔE00) changes were compared between NS and S in distinct dental groups using the Mann-Whitney test (α=0.05). The corresponding 50:50% acceptability thresholds were used to analyze the whiteness (WAT) and color (AT) differences obtained in this study. For all teeth groups, NS showed similar median WID values than S at baseline (D0) (p>0.05), but higher values than S for the other evaluation times (D1, D15, and D30) (p≤0.05).For ΔWID values, NS showed greater differences values (D1-D0, D15-D0, and D30-D0) for CI and C when compared to those of S (p≤0.05), and all these differences were above WAT value. In addition, although NS showed higher ΔWID values than S for the period D30-D1 (p≤0.05), both of them were below WAT value. ΔE00 values showed similar behavior than ΔWID for all the groups. Smoking influenced on the whiteness and color alterations, after at-home bleaching treatment using 22% CP. However, the observed whiteness and color alterations were clinically acceptable for smokers.