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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Phase conversion of tricalcium phosphate into Ca-deficient apatite during sintering of hydroxyapatite-tricalcium phosphate biphasic ceramics.
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Phase conversion of tricalcium phosphate into Ca-deficient apatite during sintering of hydroxyapatite-tricalcium phosphate biphasic ceramics.

机译：羟基磷灰石-磷酸三钙双相陶瓷烧结过程中，磷酸三钙向钙缺乏磷灰石的相转化。

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摘要

In this study, we report a new observation on the phase conversion that occurs during the sintering of hydroxyapatite (HA)-tricalcium phosphate (TCP) biphasic ceramics. During the sintering of the HA-TCP mixture powders, a large amount of TCP was converted into HA, as detected by X-ray diffraction. The amount of TCP transformed into HA was approximately 10-90% of that initially added. From the electron probe microscopy analysis, the HA transformed from TCP was found to be Ca-deficient with Ca/P ratios of 1.62-1.64. The dissolution behavior and osteoblastic responses in a series of HA-TCP biphasic ceramics (10-90% TCP) were assessed. The solubility of the HA-TCP biphasic ceramics was intermediate between that of the HA and TCP pure ceramics. However, in the case of the HA-90% TCP biphasic ceramic, the solubility was even higher than that of pure TCP. The cell proliferation and alkaline phosphatase activity of the cells on the biphasic ceramics were lower than those on pure HA, but higher than those on pure TCP. However, particularly in the HA-50% TCP biphasic composition, the cellular responses were significantly higher than those on pure HA. It is considered that the Ca-deficient apatite newly formed from the TCP may affect in some way the solubility and biological properties of the HA-TCP biphasic ceramics.
机译：在这项研究中，我们报告了对羟基磷灰石（HA）-磷酸三钙（TCP）双相陶瓷烧结过程中发生的相变的新观察。通过X射线衍射检测，在HA-TCP混合物粉末的烧结过程中，大量的TCP转化为HA。转换为HA的TCP量约为最初添加量的10-90％。从电子探针显微镜分析，发现从TCP转化的HA是缺钙的，Ca / P比为1.62-1.64。评估了一系列HA-TCP双相陶瓷（10-90％TCP）中的溶解行为和成骨反应。 HA-TCP两相陶瓷的溶解度介于HA和TCP纯陶瓷之间。但是，对于HA-90％TCP双相陶瓷，其溶解度甚至高于纯TCP。双相陶瓷上的细胞增殖和碱性磷酸酶活性低于纯HA的细胞，但高于纯TCP的细胞。但是，特别是在HA-50％TCP双相组合物中，细胞应答明显高于纯HA的应答。据认为，由TCP新形成的缺钙磷灰石可能以某种方式影响HA-TCP双相陶瓷的溶解度和生物学特性。

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