Department of Operative Dentistry, College of Dentistry, University Estadual Paulista-UNESP, Brazil.
Department of Restorative Dentistry, Faculty of Dentistry, University of Chile.
J Esthet Restor Dent. 2016 Mar;28 Suppl 1:S68-77. doi: 10.1111/jerd.12204. Epub 2016 Mar 16.
Evaluate the immediate and cumulative optical whitening efficacy of a blue covarine toothpaste.
180 bovine tooth specimens with similar shade (ΔE < 3.5) were staining of different beverage: black tea(BT), green tea (GT), red wine (RW), orange soda (OS), and brazilian açai juice (AJ), and then submitted to tooth brushing with a blue covarine toothpaste (Op) or a control abrasive toothpaste (Ab). The whitening effect was evaluated at baseline (B), after staining (S), after 1 day (1D) and 7 days of cumulative use of toothpastes (7D). The color shade chances were assessment by Vita Easyshade reflectance spectroscope and the data of CIELab color coordinates (L*, a*, and b*), color difference (ΔE) and the whiteness index optimized (WIO), were analyzed by two-way mixed analysis of variance (ANOVA) for repeated measures and Bonferroni-corrected t-tests (α = 0.05).
The analysis showed statistically significant differences before and after staining by colored beverages (p < 0.05), but no differences were found due to the action of toothpaste (p > 0.05), in the CIELab coordinates, ΔE and WIO index.
The use of toothpastes (Op or Ab) reduced the dental staining caused by different colored beverage, but the whitening effect of blue covarine toothpaste could not be confirmed (p > 0.05).
评估一种含蓝色 covarine 的牙膏即刻和累积光学增白效果。
180 个具有相似色调（ΔE<3.5）的牛牙标本用不同的饮料进行染色：红茶（BT）、绿茶（GT）、红酒（RW）、橙汁（OS）和巴西莓汁（AJ），然后用含蓝色 covarine 的牙膏（Op）或对照研磨性牙膏（Ab）进行刷牙。在基线（B）、染色后（S）、使用牙膏 1 天（1D）和 7 天累积使用后（7D）评估增白效果。使用 Vita Easyshade 反射分光光度计评估颜色变化，并使用 CIELab 颜色坐标（L*、a和 b）、色差（ΔE）和优化的白度指数（WIO）分析数据，采用重复测量双向混合方差分析（ANOVA）和 Bonferroni 校正 t 检验（α=0.05）。
分析表明，有色饮料染色前后存在统计学差异（p<0.05），但牙膏作用无差异（p>0.05），CIELab 坐标、ΔE 和 WIO 指数均无差异。
使用牙膏（Op 或 Ab）可减少不同颜色饮料引起的牙齿染色，但无法证实蓝色 covarine 牙膏的增白效果（p>0.05）。
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