Shie Ming-You, Huang Tsui-Hsien, Kao Chia-Tze, Huang Chiao-Hui, Ding Shinn-Jyh
Institute of Stomatology, Chung-Shan Medical University, Taichung, Taiwan, Republic of China.
J Endod. 2009 Jan;35(1):98-101. doi: 10.1016/j.joen.2008.09.015. Epub 2008 Oct 31.
The purpose of this study was to investigate the effect of two solutions differing by pH (6.4 and 4.0) and the use of a setting accelerator (15% Na(2)HPO(4) solution) on the properties of white-colored mineral trioxide aggregate (WMTA). These studies indicated that pH 4.0 had a deleterious effect on the morphology of WMTA mixed with water, however, not for WMTA mixed with Na(2)HPO(4). When immersed in a pH 4.0 solution for 7 days, WMTA mixed with water or Na(2)HPO(4) achieved a diametral tensile strength of 7.9 and 9.0 MPa, respectively, which was significantly lower (p < 0.05) than those obtained at pH 6.4 (11.2 and 12.0 MPa) but significantly higher (p < 0.05) than day 0 samples (4.4 and 4.8 MPa). Mixing WMTA with the accelerator did not significantly affect the microstructure, solubility, or strength in an acidic environment.
本研究的目的是调查两种pH值不同（6.4和4.0）的溶液以及使用促凝剂（15% Na₂HPO₄溶液）对白色矿物三氧化物凝聚体（WMTA）性能的影响。这些研究表明，pH 4.0对与水混合的WMTA的形态有有害影响，然而，对于与Na₂HPO₄混合的WMTA则没有。当在pH 4.0的溶液中浸泡7天时，与水或Na₂HPO₄混合的WMTA的径向拉伸强度分别达到7.9和9.0 MPa，这显著低于（p < 0.05）在pH 6.4时获得的值（11.2和12.0 MPa），但显著高于（p < 0.05）第零天的样品（4.4和4.8 MPa）。在酸性环境中，将WMTA与促凝剂混合对其微观结构、溶解度或强度没有显著影响。
