Chemical composition and porosity characteristics of calcium silicate-based endodontic cements are important determinants of their clinical performance. Therefore, the aim of this study was to investigate the chemical composition and porosity characteristics of various calcium silicate-based endodontic cements: MTA-angelus, Bioaggregate, Biodentine, Micromega MTA, Ortho MTA, and ProRoot MTA. The specific surface area, pore volume, and pore diameter were measured by the porosimetry analysis of N2 adsorption/desorption isotherms. Chemical composition and powder analysis by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) were also carried out on these endodontic cements. Biodentine and MTA-angelus showed the smallest pore volume and pore diameter, respectively. Specific surface area was the largest in MTA-angelus. SEM and EDS analysis showed that Bioaggregate and Biodentine contained homogenous, round and small particles, which did not contain bismuth oxide.

中文翻译：

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各种硅酸钙基牙髓骨水泥的化学组成和孔隙率特性。

硅酸钙基牙髓水泥的化学成分和孔隙率特性是决定其临床性能的重要因素。因此，本研究的目的是研究各种基于硅酸钙的牙髓水泥的化学组成和孔隙率特征：MTA-天使石，生物骨料，Biodentine，Micromega MTA，Ortho MTA和ProRoot MTA。通过N 2吸附/解吸等温线的孔隙率分析法测量比表面积，孔体积和孔径。还对这些牙髓水泥进行了化学成分和粉末分析，分别通过扫描电子显微镜（SEM）和能量色散谱（EDS）进行。Biodentine和MTA-angelus分别显示出最小的孔体积和孔径。比表面积是MTA-天使中最大的。