经微弧氧化处理的钛铌锆锡合金种植体的动物实验研究

Experimental study of Ti-24Nb-4Zr-7.9Sn alloy after treated with micro-arc oxidation in vivo

目的研究微弧氧化(MAO)处理钛铌锆锡合金(TNZS)种植体的生物学性能,从界面形态学和组织学角度证实微弧氧化表面处理技术在钛合金种植体中应用的可行性和价值。方法将未作处理的与微弧氧化处理的钛铌锆锡合金种植体植入兔一侧胫骨内髁,对侧以纯钛种植体作为对照,分别于植入后4、26周取材,采用X线摄片检测和苏木精-伊红染色方法对3种种植体-骨界面改建过程进行动态观察,比较各组之间的异同。结果随着时间的延长,所有种植体愈合良好,X线片显示在2个观察时间点,TNZS和MAO-TNZS种植体周围均无明显阴影,骨质密度和骨小梁的排列与宿主骨基本一致,与对照组纯钛之间无明显差异;组织学观察发现,4周时所有种植体-骨界面之间有轻微间隙,可见由大量细胞外基质和纤维组织充填,骨内可见大量类骨质沉积,提示骨再建活跃;26周时MAO-TNZS种植体-骨界面间隙消失,种植体周围新生骨板层与宿主骨融为一体,界面区出现典型的哈佛系统,达到了骨整合。结论经微弧氧化处理的钛铌锆锡种植体能与骨形成骨性结合,显示了良好的生物相容性及较好的稳定性,并具有临床应用潜力,值得进一步研究。

Objective To study the biocompatibility of Ti-24Nb-4Zr-7.9Sn （TNZS） alloy treated with micro-arc oxidation （MAO）. Methods The tibia bones of New Zealand rabbits were used to build the animal model. TNZS and MAO-TNZS samples were implanted into one side of tibia, pure titanium samples were implanted into the other side as control. After 4 and 26 weeks, radiographs and HE staining technique was used to observe the dynamic remodeling process of bane-implant interface. Results As the cure time increased, it was showed well biocompatibility of all implants. X-ray indicated that there was no permeable area produced around the three different materials at each time point. The density of bone matrix and arrangement of bone trabecula was almost the same as in the host bone. It was revealed by histological examination that the MAO-TNZS greatly prompted the bonding ability between implant and surrounding hard tissues. Four weeks after implantation, fine attachment was found at the bone-implant interface of all the implants and the fibrous tissue at the interface was gradually remodeled to form new bone. Twenty-six weeks later, MAO-TNZS showed that a biological fixation was created between bone and oxidation layer, while a layer of fibers formed between non-coated TNZS and titanium implants surrounding bone. Conclusion The Ti-24Nb-4Zr-7.9Sn after treated with micro-arc oxidation shows good biocompatibility and can stimulate the bone growth in the bone-implant region, which provides support for clinical usage tests of TNZS alloy as implant after treated with micro-arc oxidation.