Oper Dent. 2019 Mar/Apr;44(2):138-145. doi: 10.2341/17-333-C. Epub 2018 Aug 14.
: To investigate the effect of whitening dentifrices on the effectiveness of in-office tooth bleaching.
: A double-blind randomized controlled clinical trial was performed. The participants were randomly allocated into three groups according to the different dentifrices used during this clinical trial: regular dentifrice (group C), conventional whitening dentifrice (group CW), and whitening dentifrice containing blue covarine (group CU). All participants received in-office tooth bleaching for the maxillary anterior teeth (two sessions conducted at a one-week interval). Tooth color was measured with a spectrophotometer at baseline (T1), after the first bleaching session (T2), after the second bleaching session (T3); one week after the completion of in-office bleaching (T4); and three weeks after the completion of in-office bleaching (T5). The data were statistically analyzed through repeated analysis of variance and the Tukey test (α=0.05).
: Sixty participants completed the study (n=20 per group). At T3, group CU exhibited the lowest ΔE values ( p=0.008). The ΔE values increased from T4 to T5 in the CW and CU groups, whereas a decrease in ΔE values was observed for group C.
: The use of a whitening dentifrice containing blue covarine during in-office bleaching reduced color changes. After tooth bleaching, brighter tooth colors were observed in the participants who brushed with whitening dentifrices compared to those who brushed with a regular dentifrice.
研究美白牙膏对诊室牙齿美白效果的影响。
进行了一项双盲随机对照临床试验。参与者根据本临床试验中使用的不同牙膏随机分为三组：普通牙膏组（C 组）、常规美白牙膏组（CW 组）和含蓝色 covarine 的美白牙膏组（CU 组）。所有参与者均接受诊室牙齿美白治疗（上颌前牙，两次治疗间隔一周）。在基线（T1）、第一次漂白治疗后（T2）、第二次漂白治疗后（T3）、诊室漂白治疗完成后一周（T4）和诊室漂白治疗完成后三周（T5）使用分光光度计测量牙齿颜色。通过重复方差分析和 Tukey 检验（α=0.05）对数据进行统计学分析。
60 名参与者完成了研究（每组 20 名）。在 T3 时，CU 组的 ΔE 值最低（p=0.008）。CW 和 CU 组的 ΔE 值从 T4 增加到 T5，而 C 组的 ΔE 值则下降。
在诊室漂白期间使用含蓝色 covarine 的美白牙膏可减少颜色变化。牙齿漂白后，与使用普通牙膏的参与者相比，使用美白牙膏的参与者的牙齿颜色更亮。
