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首页> 外文会议>13th International Symposium on Ceramics in Medicine and the Annual Meeting of the International Society for Ceramics in Medicine 22-26 November 2000 Bologna, Italy >CaO-P_2O_5 Glass Ceramics Containing Bioactive Phases: Crystallisation and in Vitro Bioactivity Studies
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CaO-P_2O_5 Glass Ceramics Containing Bioactive Phases: Crystallisation and in Vitro Bioactivity Studies

机译：含生物活性相的CaO-P_2O_5玻璃陶瓷：结晶和体外生物活性研究

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摘要

CaO-P_2O_5 glass ceramics were prepared using a two-step heat treatment of nucleation and crystal growth using TiO_2 and Na_2O as nucleating agents. X-ray diffraction analysis demonstrated that bioactive and bioresorbable crystalline phases were precipitated in the microstructure, depending upon the relative content of the additives and of the CaO/P_2O_5 ratio of the glass. Ca_2P_2O_7 (beta-DCP) was the main crystalline phase however beta-Ca_3(PO_4)_2 (beta-TCP), could also be formed by increasing the content of TiO_2 and the CaO/P_2O_5 ratio. Na and Ti-containing phases, CaTi_4(PO_4)_6, and/or NaTi_2(PO_4)_3, could also be assigned in the XRD spectra. In vitro testing in simulated body fluid (SBF) has proved the in vitro bioactivity of these glass ceramics with the formation of Ca-deficient apatite crystals, as demonstrated by Scanning electron Microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses.
机译：使用TiO_2和Na_2O作为成核剂，通过成核和晶体生长的两步热处理来制备CaO-P_2O_5玻璃陶瓷。 X射线衍射分析表明，取决于添加剂的相对含量和玻璃的CaO / P_2O_5比例，生物活性和生物可吸收的结晶相在微观结构中沉淀。 Ca_2P_2O_7（β-DCP）是主要的结晶相，但也可以通过增加TiO_2的含量和CaO / P_2O_5的比例来形成β-Ca_3（PO_4）_2（β-TCP）。还可以在XRD光谱中指定含Na和Ti的相CaTi_4（PO_4）_6和/或NaTi_2（PO_4）_3。如扫描电子显微镜（SEM）和X射线光电子能谱（XPS）分析所证明的，在模拟体液（SBF）中进行的体外测试证明了这些玻璃陶瓷的体外生物活性，并形成了缺钙的磷灰石晶体。

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