为改善羟基磷灰石(HA)涂层与Ti基体的结合性能及成骨性能, 在纯Ti表面先通过微弧氧化方法形成多孔TiO2, 然后通过溶胶-凝胶法在其上形成ZnHA生物涂层. 利用SEM和XRD观察和分析样品的表面形貌和物相组成, 采用火焰原子吸收分光光度法测量Zn2+的释放浓度. 将MG-63细胞直接接种于样品表面, 评价成骨细胞在样品表面的黏附和增殖. 噻唑蓝(MTT)比色分析结果表明, 细胞在ZnHA/TiO2-2和ZnHA/TiO2-3涂层的样品表面增殖率比对照组(HA)显著增加, 倒置荧光显微镜下可观察到细胞在改性样品表面黏附和伸展良好. 由此表明, 带有ZnHA/TiO2复合涂层的Ti种植体应具有更好的机械结合性能和生物相容性.
A zinc-containing hydroxyapatite (ZnHA)/titania (TiO2) hybrid coating is developed to improve the mechanical character and biocompatibility of titanium (Ti) implants. The ZnHA layer on Ti via sol-gel method after treated by micro-arc oxidation (MAO) to produce an ZnHA/TiO2 porous titania coating on Ti implants. The chemical composition and physical structure of the modified surface layers were characterized by X-ray photoelectron spectroscopy (XPS) as well as scanning electron microscope (SEM). At the same time, in vitro co-culture assays were performed to evaluate the cell morphology, adhesion and proliferation of MG-63 cells to the modified titanium. The cells micro morphology on the ZnHA/TiO2 coatings were more polygonal compared with round than that on HA/TiO2 coatings by SEM. It was confirmed by Fluorescence microscopy observations that the osteoblast-like cells on the hybrid coating layer adhesion and spread favorably. The results in this work suggest that ZnHA/TiO2 hybrid coatings on Ti substrates can function as an implant with good mechanical character and biocompatibility.
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