Guven Yeliz, Tuna Elif Bahar, Dincol Muzaffer Emin, Aktoren Oya
Department of Pedodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkiye.
Department of Endodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkiye.
Eur J Dent. 2014 Apr;8(2):211-215. doi: 10.4103/2278-344X.130603.
The purpose of this study was to investigate and compare the crystalline structures of recently released MTA Plus (MTA-P), MTA Angelus (MTA-A), DiaRoot BioAggregate (BA) by X-ray diffraction (XRD) analysis.
Phase analysis was carried out on powder and set forms of tested materials. The powder specimens placed into sample holders that were packed with a glass slide and the set samples prepared according to the manufacturer's instructions were placed into molds. The samples after being set for three days at 37°C and 100% humidity in an incubator were mounted onto the XRD machine and phase identification was accomplished using a search-match software program.
XRD findings indicated that major constituents of MTA-P were bismuth oxide, portlandite, dicalcium silicate and tricalcium silicate. The crystal structure of MTA-A were similar to those of MTA-P except for the absence of portlandite. Additionally, MTA-A had tricalcium aluminate differing from MTA-P. BA mainly differed from MTA-P and MTA-A by the radiopacifier (tantalum oxide-TO) in its composition.
The majority of constituents of the tested materials have shown similarity except for the presence of tricalcium aluminate in MTA-A and the inclusion of TO in BA. In addition, set MTA-P showed a strong peak of portlandite.
本研究旨在通过X射线衍射（XRD）分析来研究和比较近期推出的MTA Plus（MTA-P）、MTA Angelus（MTA-A）、DiaRoot生物活性骨水泥（BA）的晶体结构。
对测试材料的粉末和凝固形式进行相分析。将粉末标本放入装有载玻片的样品架中，按照制造商说明制备的凝固样品放入模具中。在37°C和100%湿度的培养箱中放置三天后的样品安装到XRD机器上，并使用搜索匹配软件程序完成相鉴定。
XRD结果表明，MTA-P的主要成分是氧化铋、氢氧化钙、硅酸二钙和硅酸三钙。MTA-A的晶体结构与MTA-P相似，只是没有氢氧化钙。此外，MTA-A含有与MTA-P不同的铝酸三钙。BA与MTA-P和MTA-A的主要区别在于其成分中的射线不透光剂（氧化钽-TO）。
除MTA-A中存在铝酸三钙和BA中含有TO外，测试材料的大多数成分显示出相似性。此外，凝固后的MTA-P显示出强烈的氢氧化钙峰。
