诊室美白凝胶pH值对过氧化氢透过牙釉质扩散及牛牙颜色变化的影响。

Influence of in-office whitening gel pH on hydrogen peroxide diffusion through enamel and color changes in bovine teeth.

作者信息

Pignoly Christian, Camps Lila, Susini Guy, About Imad, Camps Jean

机构信息

Laboratory of Extracellular Matrix Interface-Biomaterials, Faculty of Dentistry, University of the Mediterranean, Marseille, France.

出版信息

Am J Dent. 2012 Apr;25(2):91-6.

PMID:22779282

Abstract

PURPOSE

To assess the influence of in-office whitening gel pH on whitening efficiency.

METHODS

Hydrogen peroxide diffusion and color changes on bovine teeth were assessed. Three gels with close hydrogen peroxide concentrations but with various pH levels were tested: Zoom 2 (Discus Dental), Opalescence Endo and Opalescence Boost (Ultradent). The pH levels were respectively: 3.0, 5.0 and 7.0. Thirty enamel slices and tooth crowns were used for both studies (n = 10 per group per study). Hydrogen peroxide diffusion through the enamel slices and the tooth crowns was spectrophotometrically recorded every 10 minutes for 1 hour to calculate the diffusion coefficients. Color changes were spectrophotometrically recorded every 10 minutes for 1 hour and quantified in term of CIE-Lab.

RESULTS

The hydrogen peroxide diffusion coefficient through enamel ranged from 5.12 +/- 0.82 x 10(-9) cm2 s(-1) for pH 3 to 5.19 +/- 0.92 x 10(-9) cm2 S(-1) for pH 7. Through tooth crowns it ranged from 4.80 +/- 1.75 x 10(-10) cm2 s(-1) for pH 5 to 4.85 +/- 1.82 x 10(-10) cm2 s(-1) for pH 3. After 1 hour, the deltaE varied from 5.6 +/- 4.0 for pH 7 to 7.0 +/- 5.0 for pH 3 on enamel slices and from 3.9 +/- 2.5 for pH 5 to 4.9 +/- 3.5 for pH 7 on tooth crowns. There was no statistically significant difference between groups for both parameters.

摘要

目的

评估诊室美白凝胶的pH值对美白效果的影响。

方法

评估过氧化氢在牛牙上的扩散情况及颜色变化。测试了三种过氧化氢浓度相近但pH值不同的凝胶：Zoom 2（Discus Dental公司）、Opalescence Endo和Opalescence Boost（Ultradent公司）。pH值分别为3.0、5.0和7.0。两项研究均使用了30个牙釉质切片和牙冠（每项研究每组n = 10）。每隔10分钟用分光光度法记录过氧化氢在牙釉质切片和牙冠中的扩散情况，持续1小时，以计算扩散系数。每隔10分钟用分光光度法记录1小时内的颜色变化，并根据CIE-Lab进行量化。

结果

过氧化氢在牙釉质中的扩散系数范围为，pH值3时为5.12±0.82×10⁻⁹ cm² s⁻¹，pH值7时为5.19±0.92×10⁻⁹ cm² s⁻¹。在牙冠中，其范围为pH值5时为4.80±1.75×10⁻¹⁰ cm² s⁻¹，pH值3时为4.85±1.82×10⁻¹⁰ cm² s⁻¹。1小时后，牙釉质切片上的ΔE值范围为，pH值7时为5.6±4.0，pH值3时为7.0±5.0；牙冠上的ΔE值范围为，pH值5时为3.9±2.5，pH值7时为4.9±3.5。两组在这两个参数上均无统计学显著差异。