The formation of a hydroxyl bond and the effects thereof on bone-like apatite formation on a magnesia partially stabilized zirconia (MgO–PSZ) bioceramic following COub>2ub> laser irradiatio

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• 作者：Hao ; L. ; Lawrence ; J. ; Chian ; K. S. ; Low ; D. K. Y. ; Lim ; G. C. ; Zheng ; H. Y.
• 刊名：Journal of Materials Science Materials in Medicine
• 出版年：2004
• 出版时间：2004
• 年：2004
• 卷：15
• 期：9
• 页码：967-975
• 全文大小：887 KB

文摘

For the purpose of improving the bioactivity of a magnesia partially stabilized zirconia (MgO–PSZ) and to explore a new technique for inducing OH group and apatite formation, a COub>2ub> laser has been used to modified the surface properties. The bioactivity of the COub>2ub> laser modified MgO–PSZ has been investigated in stimulated human fluids (SBF) with ion concentrations almost equal to those in human blood plasma. Some hydroxyl groups were found on the MgO–PSZ following COub>2ub> laser treatment with selected power densities. The surface melting on the MgO–PSZ induced by COub>2ub> laser processing provides the Zrup>4+up> ion and OHup>−up> ion, in turn, the incorporation of the Zrup>4+up> ion and the OHup>−up> ion creates the Zr–OH group on the surface. After 14 days of SBF soaking, the apatites formed on the MgO–PSZ with relatively high amount of hydroxyl groups generated by the COub>2ub> laser treatment, while no apatite was observed on the untreated with few hydroxyl groups. It exhibits that the Zr–OH groups on the MgO–PSZ surface is the functional groups to facilitate the apatite formation. The increased surface roughness provides more active sites, meantime, increased surface energy benefits to the adsorption and reaction on the surface.