Belío-Reyes Irma Araceli, Bucio Lauro, Cruz-Chavez Esther
Facultad de Odontología, Universidad Autónoma de Sinaloa, Culiacan, Sinaloa, Mexico.
J Endod. 2009 Jun;35(6):875-8. doi: 10.1016/j.joen.2009.03.004. Epub 2009 Apr 19.
Composition and crystalline phases of the endodontic material mineral trioxide aggregate (MTA) is of fundamental importance for understanding its physical and chemical properties. This research was done to determine the composition of crystalline phases for ProRoot MTA.
For phase identification, powder of ProRoot MTA was analyzed by x-ray diffraction (XRD), comparing the MTA peaks with the data contained in the Powder Diffraction File of the International Centre for Diffraction Data (ICDD). To help the task of identifying a phase, chemical analysis by energy-dispersive spectrometry (EDS) and particle-induced x-ray emission (PIXE) were applied. Quantitative phase analysis was performed by applying Rietveld refinement to the XRD data.
ProRoot MTA is composed of bismuth oxide (19.8%), tricalcium silicate (51.9%), dicalcium silicate (23.2%), calcium dialuminate (3.8%), and calcium sulfate dehydrated (1.3%). The trace elements detected were Fe, Ni, Cu, and Sr.
Rietveld refinement was able to analyze the composition of ProRoot MTA, which is based basically on a mixture of Portland cement (with smaller quantities of calcium dialuminate and calcium sulfate dehydrated) and bismuth oxide for radiopacity.
牙髓材料三氧化矿物凝聚体（MTA）的成分和晶相对于理解其物理和化学性质至关重要。本研究旨在确定ProRoot MTA的晶相组成。
为进行相鉴定，采用X射线衍射（XRD）分析ProRoot MTA粉末，将MTA的峰与国际衍射数据中心（ICDD）粉末衍射文件中的数据进行比较。为辅助相鉴定工作，应用了能量色散光谱（EDS）和粒子诱导X射线发射（PIXE）进行化学分析。通过对XRD数据应用Rietveld精修进行定量相分析。
ProRoot MTA由氧化铋（19.8%）、硅酸三钙（51.9%）、硅酸二钙（23.2%）、铝酸二钙（3.8%）和无水硫酸钙（1.3%）组成。检测到的微量元素有铁、镍、铜和锶。
Rietveld精修能够分析ProRoot MTA的组成，其基本基于波特兰水泥（含有少量铝酸二钙和无水硫酸钙）和用于射线不透性的氧化铋混合物。
