Oper Dent. 2017 Nov/Dec;42(6):572-580. doi: 10.2341/16-126-C.
This clinical study evaluated the color longevity after 30 months of at-home bleaching with 10% carbamide peroxide (CP) in smokers and nonsmokers.
Sixty patients, 30 smokers and 30 nonsmokers, were subjected to bleaching with 10% CP (Whiteness Perfect-FGM) for three hours daily for three weeks. The color was measured at baseline and at one month and 30 months after the completion of dental bleaching using the shade guide Vita classical organized by value (ΔSGU) and the shade guide Vita Bleachedguide 3D-MASTER. At the 30-month recall, the color was assessed before and after dental prophylaxis. Data from color evaluation were analyzed by two-way repeated-measures analysis of variance and Tukey test for the contrast of means (α=0.05).
Twenty-one smokers and 22 nonsmokers attended the 30 month recall. For both shade guides, only the main factor of assessment time was statistically significant (p<0.001). Effective whitening was observed in both groups at the baseline, which was stable at one month. However, color rebound was observed after 30 months for both groups of participants when color was measured before and after dental prophylaxis.
Thirty months after at-home bleaching with 10% CP gel, dental darkening was detected in both groups, which cannot be solely attributed to stains caused by extrinsic staining from daily food, drinks, and smoke (in smokers).
本临床研究评估了吸烟者和非吸烟者在家用 10%过氧化氢（CP）漂白 30 个月后的颜色持久度。
60 名患者，30 名吸烟者和 30 名非吸烟者，使用 10%CP（Whiteness Perfect-FGM）进行漂白，每天三小时，持续三周。在基线、漂白完成后一个月和 30 个月使用 Vita classical 比色指南（ΔSGU）和 Vita Bleachedguide 3D-MASTER 比色指南测量颜色。在 30 个月的随访中，在进行牙齿洁治术前和术后评估颜色。使用双向重复测量方差分析和 Tukey 检验对颜色评估数据进行分析，用于均值比较（α=0.05）。
21 名吸烟者和 22 名非吸烟者参加了 30 个月的随访。对于两个比色指南，只有评估时间的主要因素具有统计学意义（p<0.001）。两组在基线时均观察到有效漂白，一个月时保持稳定。然而，在进行牙齿洁治术前和术后测量颜色时，两组参与者在 30 个月时均观察到颜色反弹。
在使用 10%CP 凝胶进行家庭漂白 30 个月后，两组均检测到牙齿变暗，这不能仅归因于日常食物、饮料和吸烟（在吸烟者中）引起的外源性染色导致的污渍。
