Evaluation of calcium-releasing and apatite-forming abilities of fast-setting calcium silicate-based endodontic materials
Evaluation of calcium-releasing and apatite-forming abilities of fast-setting calcium silicate-based endodontic materials
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DOI：
10.1111/iej.12290
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发表时间：
2015-02-01
影响因子：
5
通讯作者：
Okiji, T.
中科院分区：
文献类型：
--
作者：
Han, L.;Kodama, S.;Okiji, T.
目的评价两种快速固化硅酸钙根管材料（Endocem mineral trioxide aggregate，MTA和Endocem Zr）在磷酸盐缓冲液（phosphate-buffered saline，PBS）中释放钙离子（Ca 2+）和产生磷灰石样沉淀的能力。用具有图像观察功能的波长色散X射线光谱电子探针显微分析仪（SEM-EPMA）分析每种材料的粉末的化学组成。用EDTA滴定法测定了水浸泡水泥中钙离子的释放量。用SEM-EPMA分析了PBS浸泡水泥表面形成的沉淀物的形貌和化学成分。结果Endocem MTA和WMTA中钙、硅、铋含量最高，其次为锆、钙、硅;而Endocem Zr中锆含量最高，其次为钙、硅。Ca ~（2+）释放量WMTA >Endocem MTA Endocem Zr。在PBS中浸泡14天后，三种材料产生含Ca和P的磷灰石样表面沉淀。WMTA与Endocem Zr相比，其沉淀物中Ca/P比值明显升高，差异有统计学意义（P
AimTo evaluate two fast-setting calcium silicate-based endodontic materials (Endocem mineral trioxide aggregate (MTA) and Endocem Zr) with regard to their ability to release calcium ions (Ca2+) and produce apatite-like precipitates after immersion in phosphate-buffered saline (PBS).MethodologyEndocem MTA, Endocem Zr and white ProRoot MTA (WMTA) were used. Chemical composition of the powder of each material was analysed with a wavelength-dispersive X-ray spectroscopy electron probe microanalyser with image observation function (SEM-EPMA). The amount of Ca2+ released from water-immersed set cements was measured with an EDTA titration method. Morphology and chemical composition of surface precipitates formed on the surface of PBS-immersed cements were analysed with the SEM-EPMA. Data obtained were analysed using one-way analysis of variance and Tukey's honestly significant difference test with a significance level of 5%.ResultsEndocem MTA and WMTA contained calcium (Ca), silicon (Si) and bismuth as the major elemental constituents, whereas Endocem Zr contained zirconium as the most abundant element, followed by Ca and Si. The amount of Ca2+ release was WMTA >Endocem MTA Endocem Zr. After immersion in PBS for 14days, the three materials produced Ca- and phosphorus (P)-containing apatite-like surface precipitates. WMTA showed higher Ca/P ratio of the precipitates compared with the other cements, with statistical significance between WMTA and Endocem Zr (P