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首页> 外文期刊>American journal of dentistry >Dielectrophoresis enhances the whitening effect of carbamide peroxide on enamel.
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Dielectrophoresis enhances the whitening effect of carbamide peroxide on enamel.

机译：介电电泳增强了过氧化脲对牙釉质的增白作用。

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PURPOSE: To compare the enamel whitening effect of a 20-minute dielectrophoresis enhanced electrochemical delivery to a 20-minute diffusion treatment. METHODS: Forty freshly extracted human teeth without detectable caries or restoration were stored in distilled water at 4 degrees C and used within 1 month of extraction. Two different bleaching gels (Plus White 5 Minute Speed Whitening Gel and 35% Opalescence PF gel) were tested. The study had two parts: Part 1--Quantitative comparison of hydrogen peroxide (H2O2, HP) absorption--following application of an over-the-counter 35% HP whitening gel (Plus White 5 Minute Speed Whitening Gel) to 30 (n = 30) extracted human teeth by conventional diffusion or dielectrophoresis. The amount of H2O2 that diffused from the dentin was measured by a colorimetric oxidation-reduction reaction kit. HP concentration was measured by UV-Vis spectroscopy at 550 nm. Part 2--HP diffusion in stained teeth--35% carbamide peroxide whitening gel (35% Opalescence PF gel) was applied to 10 extracted human teeth (n = 10) stained by immersion in a black tea solution for 48 hours. The teeth were randomly assigned to the 20-minute dielectrophoresis or diffusion treatment group; whitening was evaluated by a dental spectrophotometer and macro-photography. RESULTS: Part 1: The analysis found significant differences between both groups with relative percent errors of 3% or less (a single outlier had an RPE of 12%). The average absorbance for the dielectrophoresis group in round 1 was 79% greater than the diffusion group. The average absorbance for the dielectrophoresis group in round 2 was 130% greater than the diffusion group. A single-factor ANOVA found a statistically significant difference between the diffusion and dielectrophoresis groups (P = 0.01). Part 2--The average change in Shade Guide Units (SGU) was 0.6 for the diffusion group, well under the error of measurement of 0.82 SGU. The average change in SGU for the dielectrophoresis group was 9, significantly above the error of measurement and 14 times or 1,400% greater than the diffusion group average. A single-factor ANOVA found a statistically significant difference between the diffusion and dielectrophoresis treatment groups (P < 0.001).
机译：目的：为了比较20分钟介电电泳增强的电化学传递与20分钟扩散处理的搪瓷增白效果。方法：将四十只新鲜提取的，没有可检测到的龋齿或缺损的人类牙齿保存在4摄氏度的蒸馏水中，并在提取后的1个月内使用。测试了两种不同的漂白凝胶（Plus White 5分钟速速增白凝胶和35％Opalescence PF凝胶）。该研究分为两个部分：第1部分-过氧化氢（H2O2，HP）吸收的定量比较-在使用非处方35％HP美白凝胶（Plus White 5 Minute Speed Whitening Gel）至30（n = 30）通过常规扩散或介电电泳提取人类牙齿。通过比色氧化还原反应试剂盒测量从牙本质扩散的H 2 O 2的量。通过UV-Vis光谱在550nm下测量HP浓度。将2-部分-HP在牙齿上的扩散--35％过氧化脲酰胺美白凝胶（35％Opalescence PF凝胶）应用于通过浸入红茶溶液中48小时而被染色的10颗提取的人类牙齿（n = 10）。牙齿被随机分配到20分钟介电电泳或扩散治疗组中。通过牙科分光光度计和微距摄影对美白进行评估。结果：第1部分：分析发现两组之间的显着差异，相对百分比误差为3％或更少（单个异常值的RPE为12％）。第一轮介电电泳组的平均吸光度比扩散组高79％。第二轮介电电泳组的平均吸光度比扩散组大130％。单因素方差分析发现扩散和介电泳组之间存在统计学上的显着差异（P = 0.01）。第2部分-扩散组的阴影指导单位（SGU）的平均变化为0.6，处于0.82 SGU的测量误差之下。介电电泳组的SGU平均变化为9，显着高于测量误差，比扩散组的平均值大14倍或1,400％。单因素方差分析发现扩散和介电电泳治疗组之间存在统计学差异（P <0.001）。

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