Hannah Rosaline, Mathan Rajan Rajendran, Kuzhanchinathan Manigandan
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引用次数: 0
摘要
目的：三氧化矿物骨料（MTA）是一种用于各种牙髓治疗的牙科生物材料。然而，MTA的主要限制是它的硬度和可回收性。本研究的目的是评价各种化学物质对MTA显微硬度的影响。材料与方法：制作了200个规定尺寸（高5mm，内径5mm）的空心圆柱形不锈钢模具。MTA均匀混合并凝结到模具中。设置后，MTA分别于第1天和第21天结束时暴露于3个实验组，第1组：背置，第2组：碳酸，第3组：柠檬酸。然后对样品进行维氏显微硬度测试。采用方差分析（ANOVA）对资料进行统计学评价，采用事后检验（post-hoc）， P = 0.05进行多重比较检验。结果：第1天，与碳酸和柠檬酸相比，背置组的显微硬度降低幅度更大。在第21天结束时，分别在间隔5分钟、3分钟和1分钟后，观察到最高的平均表面显微硬度降低。然而，在1和3分钟时，柠檬酸和碳酸之间没有显着差异。结论：在降低MTA显微硬度方面，与柠檬酸和碳酸相比，后置剂效果最好。
Effect of Different Chemicals on the Micro-Hardness of Mineral Trioxide Aggregate - An In vitro Study.
Aim: Mineral trioxide aggregate (MTA) is a dental biomaterial that is used for various endodontic treatments. However, the major limitation of MTA is its hardness and retrievability. The aim of this study is to evaluate the influence of various chemicals on micro-hardness of MTA.
Materials and methods: 200 hollow cylindrical stainless-steel molds of specified dimensions (5 mm height and 5 mm internal diameter) were made. MTA was mixed homogeneously and condensed into the molds. After the setting, MTA was exposed to three experimental groups, Group 1: back-set, Group 2: carbonic acid, and Group 3: citric acid at 1, 3, and 5 minute exposure at the end of Day 1 and 21. Then the samples were evaluated exposed to Vickers micro-hardness testing. The data were evaluated statistically using analysis of variance (ANOVA) and post-hoc with P = 0.05 were used to perform multiple comparison tests.
Results: On day 1, the reduction in micro-hardness was greater in back-set when compared with carbonic acid and citric acid. At the end of Day 21, the highest mean surface micro-hardness reduction was seen with back-set at 5 min, 3 min, and 1 min intervals, respectively. However, there was no significant difference noted between the citric and carbonic acids at 1 and 3 minutes.
Conclusion: It can be concluded that back-set was found to be the most effective in reducing the micro-hardness of MTA when compared to citric and carbonic acid.
期刊介绍：
Indian Journal of Dental Research (IJDR) is the official publication of the Indian Society for Dental Research (ISDR), India section of the International Association for Dental Research (IADR), published quarterly. IJDR publishes scientific papers on well designed and controlled original research involving orodental sciences. Papers may also include reports on unusual and interesting case presentations and invited review papers on significant topics.
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