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首页> 外文期刊>American journal of dentistry >Clinical evaluation of two in-office dental bleaching agents
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Clinical evaluation of two in-office dental bleaching agents

机译：两种办公牙科漂白剂的临床评价

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Purpose: To evaluate the bleaching efficacy and time required for color stability immediately after dental office bleaching. Methods: 40 subjects were randomly divided into two groups, according to the bleaching agent used: G(HP) - 35% hydrogen peroxide gel and G(CP) - 37% carbamide peroxide gel. The color was measured with a spectrophotometer before and immediately, 24 hours, 72 hours, 7 days and 15 days after the bleaching procedure. The color parameters were evaluated and the Delta E*, Delta L*, Delta a* and Delta b* values were calculated for each evaluation period. The data was statistically analyzed with Student's T-test, one-way ANOVA and Tukey's post hoc test (P = 0.05). Results: Regarding the Delta E* values, in the assessed periods there were no significant differences between groups (P = 0.05). However, the luminosity (Delta L*) decreased considerably in both groups in the first 72 hours (P = 0.05), followed by an increase at 15 days (P = 0.05) in the hydrogen peroxide group. Regarding the Delta b* values, the G(HP) showed higher negative alterations in the b* axis in the first 24 hours. The 37% carbamide peroxide gel and the 35% hydrogen peroxide gel were effective and there was no reversal of tooth color within 15 days; however a more accentuated bleaching effect was observed immediately after bleaching.
机译：目的：在牙科办公漂白后立即评估颜色稳定所需的漂白效果和时间。方法：根据使用的漂白剂，将40个受试者随机分为两组：G（HP） - 35％过氧化氢凝胶和G（CP） - 过氧化物凝胶。用分光光度计在漂白程序后立即，24小时，72小时，7天和15天用分光光度计测量颜色。评估颜色参数，并为每个评估期计算ΔE*，delta l *，delta a *和delta b *值。数据与学生的T检验，单向ANOVA和Tukey的后HOC测试进行了统计分析（P＆ = 0.05）。结果：关于Delta E *值，在评估期间，组之间没有显着差异（P＆GT; = 0.05）。然而，在前72小时的两个基团中，亮度（δ1*）在两个组中显着降低（P <= 0.05），然后在过氧化氢基团中在15天（P = 0.05）增加。关于Delta B *值，G（HP）在前24小时内显示出B *轴的更高的负变化。过氧化物凝胶和35％过氧化氢凝胶的37％有效，在15天内没有牙齿呈逆转;然而，在漂白后立即观察到更强调的漂白效果。

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