Islam I, Chng H K, Yap A U J
Faculty of Dentistry, Department of Restorative Dentistry, National University of Singapore, Singapore.
Int Endod J. 2006 Mar;39(3):220-5. doi: 10.1111/j.1365-2591.2006.01077.x.
To compare the major constituents present in ProRoot mineral trioxide aggregate (MTA), ProRoot MTA (tooth coloured formula), ordinary Portland cement and white Portland cement using powder X-ray diffractometery.
X-ray diffractometery of the four materials was carried out with the divergence and scatter slits set at 1 degree and the receiving slit at 0.10 mm. The scan range was set at 5-70 degrees and continuous scans for the theta-2theta range were run with a scan speed of 2 degrees min(-1). The patterns obtained were then compared with the Powder Diffraction Files (PDF) found in the International Centre for Diffraction Data database. The three strongest peaks were used for the identification of the constituents. The relative intensities were plotted against the angle 2theta and compared with the plots in the PDF.
The main constituents were found to be tricalcium silicate, tricalcium aluminate, calcium silicate, and tetracalcium aluminoferrite in all the four cements with the additional presence of Bi2O3 in ProRoot MTA and ProRoot MTA (tooth coloured formula).
The four cements had similar major constituents. Data on Portland cement may be used for the further development or modification of ProRoot MTA in order to improve its physical characteristics and expand its scope of clinical applications.
使用粉末X射线衍射仪比较ProRoot三氧化矿物凝聚体（MTA）、ProRoot MTA（牙齿颜色配方）、普通波特兰水泥和白色波特兰水泥中的主要成分。
对四种材料进行X射线衍射分析，发散和散射狭缝设置为1度，接收狭缝设置为0.10毫米。扫描范围设置为5 - 70度，在theta - 2theta范围内进行连续扫描，扫描速度为2度/分钟（-1）。然后将获得的图谱与国际衍射数据中心数据库中的粉末衍射文件（PDF）进行比较。使用三个最强峰来鉴定成分。将相对强度与2theta角作图，并与PDF中的图谱进行比较。
在所有四种水泥中，主要成分均为硅酸三钙、铝酸三钙、硅酸钙和铁铝酸四钙，ProRoot MTA和ProRoot MTA（牙齿颜色配方）中还额外存在Bi2O3。
这四种水泥具有相似的主要成分。波特兰水泥的数据可用于ProRoot MTA的进一步开发或改性，以改善其物理特性并扩大其临床应用范围。
