Objectives

Previous work has shown the effectiveness of a newly developed interproximal model to differentiate between the amount of remineralization caused by toothpastes used with or without a dual-phase gel treatment system containing calcium silicate, sodium phosphate salts and fluoride to repair acid-softened enamel. The aim of this study was to utilize the same interproximal model to identify how effective calcium silicate phosphate toothpastes are at reducing surface softening in the early stages of erosion. The model was also used to identify the effect of increasing the frequency of acid exposure on the reduction in surface hardness.

Methods

Human enamel specimens were prepared and mounted in an interproximal face-to-face arrangement and exposed to a cycling regime of whole human saliva, treatment, artificial saliva and 1% citric acid pH 3.75. Specimens were measured by surface microhardness at baseline and after three and seven days. The frequency of acid exposure was increased from 2 to 4 cycles a day for the second part of the study.

Results

The results showed that specimens treated with the calcium silicate phosphate toothpastes softened less than those treated with control fluoridated or non-fluoride toothpastes at each time point and following an increase in the frequency of acid exposure.

Significance

This work has demonstrated how an interproximal model can also be successfully used to determine differences in the erosion protection of various treatments as well as determining how they perform when the frequency of acid exposure is increased.

中文翻译：

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用于确定硅酸钙，磷酸钠，氟化物配方的防腐蚀作用的近邻模型

目标

先前的工作显示了新开发的牙间模型的有效性，该模型可以区分使用或不使用含有硅酸钙，磷酸钠盐和氟化物的双相凝胶处理系统来修复酸软化瓷釉的牙膏所引起的再矿化量。这项研究的目的是利用相同的近端模型来确定硅酸钙磷酸钙牙膏在侵蚀的早期阶段如何有效减少表面软化。该模型还用于确定增加酸暴露频率对降低表面硬度的影响。

方法

制备人类牙釉质标本并以近邻面对面的方式安装，并暴露于整个人类唾液，处理，人工唾液和1％柠檬酸pH 3.75的循环方案中。通过在基线以及三天和七天后的表面显微硬度来测量样品。在研究的第二部分，每天暴露于酸的频率从2个周期增加到4个周期。

结果

结果表明，在每个时间点并且随着酸暴露频率的增加，用硅酸钙磷酸钙牙膏处理的标本的软化程度均少于用对照氟化或非氟化牙膏处理的标本。

意义

这项工作证明了如何使用中间层模型来确定各种处理方法在腐蚀防护方面的差异，以及确定当酸暴露频率增加时它们如何表现。