期刊
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
卷 21, 期 5, 页码 1479-1488出版社
SPRINGER
DOI: 10.1007/s10856-010-3990-z
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The objective of this study was to propose a surface modification for a low-modulus Ti-7.5Mo alloy to initiate the formation of hydroxyapatite (HA) during in vitro bioactivity tests in simulated body fluid (SBF). Specimens of commercially pure titanium (c.p. Ti) and Ti-7.5Mo were initially immersed in a 15 M NaOH solution at 60A degrees C for 24 h, resulting in the formation of a porous network structure composed of sodium titanate (Na2Ti5O11). Afterwards, bioactive Bioglass(A (R)) particles were deposited on the surface of NaOH-treated c.p. Ti and Ti-7.5Mo. The specimens were then immersed in SBF at 37A degrees C for 1, 7 and 28 days, respectively. The apatite-forming ability of the NaOH-treated and Bioglass(A (R))-coated Ti-7.5Mo was higher than that of the c.p. Ti under the same condition. The X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS) results indicated that the deposited amounts of calcium phosphate were much greater for the surface-treated Ti-7.5Mo than for the c.p. Ti, a finding attributable to or correlated with the higher pH value of the SBF containing surface-treated Ti-7.5Mo. Moreover, in the surface-treated Ti-7.5Mo, the pH value of the SBF approached a peak of 7.66 on the first day. A combination of NaOH treatment and subsequent Bioglass(A (R)) coating was successfully used to initiate in vitro HA formation in the surface of the Ti-7.5Mo alloy.
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