pH 值对矿物三氧化物聚合体和 Aureoseal 表面硬度和微观结构的影响：一项体外研究。
Effects of pH on surface hardness and microstructure of mineral trioxide aggregate and Aureoseal: an in vitro study.
机构信息
Department of Endodontics, University of Florence, Florence, Italy.
出版信息
J Endod. 2010 Nov;36(11):1883-6. doi: 10.1016/j.joen.2010.08.015.
INTRODUCTION
The aim of the study was to evaluate the surface hardness and the morphologic microstructure of white mineral trioxide aggregate (WMTA) and Aureoseal in acid environment.
METHODS
WMTA and Aureoseal were mixed and packed into 64 cylindrical stainless steel molds. Thirty-two of each group were exposed to pH values of 4.4 and 7.4, respectively, for 7 days. Four specimens, 2 exposed to acid pH and 2 exposed to pH of 7.4, were prepared for evaluation under scanning electron microscope by using scattered electron (SE) and backscattered electron (BSE) detectors. Vickers surface hardnesses were measured in the remaining 60 samples.
RESULTS
The mean surface hardness values ± standard deviation were 37.54 ± 1.52 and 30.24 ± 1.47 for WMTA and 40.63 ± 1.35 and 28.67 ± 1.07 for Aureoseal after exposure to pH values of 7.4 and 4.4, respectively. WMTA showed higher hardness values in acid environment than Aureoseal, which showed the highest microhardness at pH values of 7.4. The SE detector revealed crystal formation on the WMTA surface at pH values of 7.4 and 4.4. In the WMTA specimens the BSE detector showed more unhydrated structures at pH values of 4.4 than at 7.4. The SE detector did not reveal crystal formation on the Aureoseal specimens at pH 7.4 and 4.4. BSE detection showed amorphous microstructures in the Aureoseal specimens treated in the pH 4.4 acid environment.
CONCLUSIONS
There was significant interaction between the cements and the environments where the cements hardened.
简介
本研究的目的是评估在酸性环境下白色矿物三氧化物聚合体（WMTA）和 Aureoseal 的表面硬度和形态微观结构。
方法
将 WMTA 和 Aureoseal 混合并填充到 64 个圆柱形不锈钢模具中。每组 32 个分别暴露于 pH 值为 4.4 和 7.4 的环境中，分别为 7 天。每组中的 4 个样本暴露于酸性 pH 值，另外 4 个样本暴露于 pH 值为 7.4，然后使用散射电子（SE）和背散射电子（BSE）探测器在扫描电子显微镜下进行评估。其余 60 个样本测量维氏表面硬度。
结果
暴露于 pH 值为 7.4 和 4.4 后，WMTA 的平均表面硬度值±标准偏差分别为 37.54±1.52 和 30.24±1.47，Aureoseal 的平均表面硬度值±标准偏差分别为 40.63±1.35 和 28.67±1.07。WMTA 在酸性环境下显示出更高的硬度值，而 Aureoseal 在 pH 值为 7.4 时显示出最高的显微硬度。SE 探测器显示 WMTA 表面在 pH 值为 7.4 和 4.4 时形成晶体。在 WMTA 样本中，BSE 探测器在 pH 值为 4.4 时显示出比 pH 值为 7.4 时更多的未水化结构。SE 探测器在 pH 值为 7.4 和 4.4 时未在 Aureoseal 样本上显示出晶体形成。BSE 检测显示在 pH 值为 4.4 的酸性环境中处理的 Aureoseal 样本呈现非晶态微观结构。
结论
水泥与硬化水泥所处的环境之间存在显著的相互作用。
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