以甲基纤维素为液体对矿物三氧化物凝聚体性能的评估。
Evaluation of Properties of Mineral Trioxide Aggregate with Methyl Cellulose as Liquid.
作者信息
Dianat Omid, Naseri Mandana, Tabatabaei Seyedeh Farnaz
机构信息
Associate Professor, Department of Endodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Postgraduate Student of Restorative and Cosmetic Dentistry, Department of Restorative and Cosmetic Dentistry, Islamic Azad University, Tehran, Iran.
出版信息
J Dent (Tehran). 2017 Jan;14(1):7-12.
OBJECTIVES
Mineral trioxide aggregate (MTA) is extensively used in endodontics. However, MTA is difficult to handle because of its granular consistency, low mechanical properties and initial looseness. The objective of this study was to assess the compressive strength (CS), diametral tensile strength (DTS), and pH of set MTA using methyl cellulose as liquid.
MATERIALS AND METHODS
White ProRoot MTA was used as the control group; modified MTA cement was prepared by mixing Portland cement, bismuth oxide and calcium sulfate (75%, 20% and 5%, respectively) as the experiment group. Methyl cellulose was used as hydrating liquid and compared with distilled water. The data were analyzed by two-way ANOVA.
RESULTS
The pH values of modified MTA cement set using deionized water and methyl cellulose were slightly, but not significantly, different (P>0.05). The DTS and CS tests for modified MTA cement hydrated with methyl cellulose showed a significant difference at one day and one week (P<0.05).
CONCLUSIONS
The results suggest that using methyl cellulose as the hydrating liquid enhances some mechanical properties but does not compromise pH of white ProRoot MTA.
目的
三氧化矿物凝聚体（MTA）在牙髓病学中被广泛应用。然而，由于其颗粒状的稠度、较低的机械性能和初始疏松度，MTA难以操作。本研究的目的是评估使用甲基纤维素作为液体时凝固后MTA的抗压强度（CS）、径向拉伸强度（DTS）和pH值。
材料与方法
将白色ProRoot MTA用作对照组；通过混合波特兰水泥、氧化铋和硫酸钙（分别为75%、20%和5%）制备改性MTA水泥作为实验组。甲基纤维素用作水化液，并与蒸馏水进行比较。数据采用双向方差分析进行分析。
结果
使用去离子水和甲基纤维素凝固的改性MTA水泥的pH值略有差异，但不显著（P>0.05）。用甲基纤维素水化的改性MTA水泥的DTS和CS测试在一天和一周时显示出显著差异（P<0.05）。
结论
结果表明，使用甲基纤维素作为水化液可增强一些机械性能，但不会影响白色ProRoot MTA的pH值。
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