結晶化ガラスA-Wと擬似体液中でその表面に形成されたアパタイト層の透過電子顕微鏡観察

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Glass-ceramic A-W containing crystalline oxyfluorapatite and β-wollastonite in an MgO-CaO-SiO_2 glassy matrix bonds to living bone through an apatite layer which is formed on its surface in the body. It has been confirmed by SEM observation, thin-film X-ray diffraction and FT-IR reflection spectroscopy that the apatite layer can be reproduced on the surface of the glass-ceramic even in an acellular simulated body fluid with ion concentrations nearly equal to those of human blood plasma. In the present study, structures of glass-ceramic A-W and the apatite layer formed on its surface in the simulated body fluid were observed under a high-resolution transmission electron microscope. In the interior of glass-ceramic A-W, both the apatite and β-wollastonite were homogeneously dispersed in a glassy matrix, taking a form of rice grain 50 nm in width and 100 nm in length. The apatite layer formed on the glass-ceramic in the simulated body fluid consisted of fine needle-like apatite crystals about 10 nm in thickness and 100 nm in length, which are elongated along c-axis and randomly oriented. The apatite crystals in the furface layer were in direct contact with those within the glass-ceramic without intervention of such silica gel layer as observed for Bioglass^【○!R】-type glasses. No crystallographic relation was observed between them. The apatite crystals in the surface layer were calcium-deficient, and contained small amounts of Mg and Si.
社団法人日本セラミックス協会の論文
1995-05-01

結晶化ガラスA-Wと擬似体液中でその表面に形成されたアパタイト層の透過電子顕微鏡観察

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