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目的 建立兔下颌骨种植体植入模型,对含Zn活性涂层种植体骨结合界面进行评价.方法 将商业纯钛加工成柱状种植体,通过微弧氧化(MAO)法制备活性涂层,根据是否加入Zn元素分为MAO-Ca/P和MAO-Zn/Ca/P涂层种植体.将2种种植体随机植入兔下颌骨,对照组植入MAO-Ca/P涂层种植体,实验组植入MAO-Zn/Ca/P涂层种植体.分别于术后4周和12周取材,组织学分析2组种植体与骨结合界面情况,比较骨质覆盖率.结果 MAO层呈微孔状结构,致密均匀,孔径随Zn元素的加入而变大.种植体骨结合界面组织形态学观察结果显示,随着时间的延长,种植体表面附着的骨质增多,术后4周和12周实验组的骨组织附着量均高于对照组,且排列更紧密.术后12周实验组的骨质覆盖率((70.8±13.6)％)显著高于对照组((55.9±13.8)％),差异具有统计学意义(P＜0.05).骨结合界面元素线扫描结果显示,术后12周实验组有生物类骨磷灰石形成.结论 Zn元素的加入能提高涂层的生物学活性,增强涂层的成骨能力,促进种植体与骨组织界面的结合.

Objective To evaluate the implant-bone interfaces on implants with active Zn coating in a rabbit model.Methods Pure titanium cylinder implants,fabricated by machining,were prepared by surface microarc oxidation (MAO).The MAO-Zn/Ca/P coated (experimental group) and the MAO-Ca/P coated (control group)implants were randomly placed in the rabbit mandible.The samples were harvested at 4 and 12 weeks postoperatively,histological analysis on the implant-bone interfaces of the two implants was performed,and the bone coverage was compared.Results The coatings of MAO presented micro-porous structure with dense and uniform features,in which size of micro-porous increased with zinc element.The histological examination of implant-bone contact interfaces showed that the bone tissues attached on the coatings increased with time.Further,the adhered bone tissue in the experimental group was thicker and denser and had a larger amount compared to that in the control group at 4 and 12 weeks postoperatively.The bone coverage in the experimental group (70.8％±13.6％) at 12 weeks postoperatively was significantly higher than that in the control group (55.9％±13.8％) (P＜0.05).The results of bone interface element showed that the apatite layer was precipitated at 12 weeks.Conclusion The addition of active zinc element can improve the biological activity of the coating,enhance the osteogenesis ability of the coating,and accelerate the osseointegration of implant-bone interfaces.