钛合金种植体表面制备的生物活性膜

背景:传统的仿生方法通常采用常规模拟体液和1.5倍模拟体液,其缺点就在于涂层生长过于缓慢,生长周期长达数周甚至几个月.目的:探讨3倍模拟体液诱导Ti-6Al-4V合金表面快速形成类羟基磷灰石涂层的能力.设计、时间及地点:体外生物学分析.实验于2008-11/2009-03在中国科学院金属研究所完成.材料:Ti-6Al-4V合金片由陕西省宝鸡市博达金属材料有限公司提供.方法:将经过预处理的Ti-6Al-4V合金浸泡在37℃的3倍模拟体液中,为保持浸泡液成分的恒定,溶液每24 h更换1次,共浸泡3 d.主要观察指标:用扫描电镜、X射线衍射仪和红外光谱仪分析涂层的形貌、相及元素组成.结果:扫描电镜观察样品浸泡1 d时,表面被沉积膜覆盖,局部区域有较大颗粒状的晶体出现.浸泡3 d时,表面完全被沉积膜覆盖,且有大量颗粒状或鳞片状晶体出现,晶体沉积以某一区域为核心,持续生长.生成物主要由Ca,P,O,C等元素组成,但是没有检测到Al,V等元素的存在.X射线衍射仪和红外光谱仪分析浸泡3 d时Ti-6Al-4V合金表面制备的生物活性膜主要成分为羟基磷灰石.结论:使用3倍模拟体液可以快速诱导Ti-6Al-4V合金表面类羟基磷灰石的沉积,显著缩短涂层形成的时间.

Preparation of titanium implant surface bioactive membrane

BACKGROUND: The coating induced by conventional simulated body fluid (SBF) and 1.5-folds SBF as biomimetic method has the shortcomings of slowly growth with weeks or months growth cycle. OBJECTIVE: To evaluate Ti-6Al-4V alloy surface deposition of hydroxyapatite coating induced by 3-folds SBF. DESIGN, TIME AND SETTING: In vitro biological analysis. The experiment was performed at the Institute of Metal Research, Chinese Academy of Sciences from November 2008 to March 2009. MATERIALS: Ti-6A1-4V alloy was supported by Boda Metel Materials Co., Ltd. METHODS: The pretreated Ti-6Al-4V alloy was immersed in 37 'C 3-folds SBF. The SBF was replaced every 24 hours for 3 days. MAIN OUTCOME MEASURES: The morphology, phase and elemental composition of calcium phosphate coating were analyzed by scanning electron microscopy, X-ray diffraction and infrared spectroscopy analysis. RESULTS: The scanning electron microscopy exhibited that the surface of Ti-6A1 -4V alloy was covered with deposited film with granular crystal on local areas at day 1 after immersion. The deposited film covered surface of Ti-6A1-4V alloy at day 3 after immersion, and granular or scale-shaped crystal could be seen. The crystal deposition displayed sustained growth with certain area as center. The product comprised Ca, P, O, C elements without Al, V. X-ray diffraction and infrared spectroscopy analysis revealed that the main component of the coating was hydroxyapatite. CONCLUSION: The 3-folds SBF can accelerate the deposition as well as shorten formation duration of hydroxyapatite coating on Ti-6A1-4V alloy.