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The feature of porous titanium is that new bone trabecular tissue could ingrow intoits pores and produce interlocking attachment.The spherical TC_4 powder and titanium fiberwere seperately implanted into the femurs of 24 dogs.The pore size of the samples was0.24mm and their rates of porosity were 40%~50%.After 3 months,the interface shearstrength examined by straight pulling test,was over 4.60±0.36MPa.Scanning electronmicroscopy showed that there were new bone components in the porous layer.Lightmicroscopy also revealed that there were new bone lacunae and their pathways in it.Thedepth of the reforming bone was 3 mm.Interface shear strength of the new bone in the po-rous layer might meet the need of load bearing.Porous materials would prevent the artificialjoint from loosening and thus help to develop a new service clinically. 相似文献
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采用热等压技术将Tc4、HA、BGC以30∶35∶35比例混合烧结成生物活性微孔钛种植体。孔内复合bBMP移植成年狗颌骨与股骨中,经LM、SEM、FM、EDXA等检测.BMP组1周界面出现大量松骨细胞及骨基质沉积,成骨细胞活跃。生物力学测试:2周2.362MPa,对照组4周才达2.214MPa。种植体综合3种材料的优点,克服各自不足,不但可进行切削性加工,制成形态各异植入体。而且还可行颌骨缺损修复。与骨组织通过3相(Tio、HA、BGC)形成化学结合及物理、机械嵌合。BMP的加入使界面成骨活动提前启动和加强,但BMP并未改变种植体内在成分和骨性融合机制。 相似文献
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BMP与骨融合式种植体复合的实验研究 总被引:1,自引:0,他引:1
BMP与微孔钛种植体、生物陶瓷涂层微孔钛种植体复合后,具有新骨形成早、骨早成熟的特点,加速了种植体-骨融合,缩短了种植周期,值得临床推广应用。 相似文献
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作者将钛(Tc_4),羟基磷灰石(HA)和生物活性玻璃陶瓷(BGC)颗粒混合烧结成生物活性微孔复合种植体复合骨形成蛋白(BMP)移植于20只成年杂种狗颌骨和股骨内,对1~12周标本进行检测、观察和成骨量的测定.证明种植体与骨界面结合在于界面存在三相性(钛氧化膜:TiO,Ti_2O,Ti_2O_3,HA晶相和BGC晶相),使钙、磷富集层形成,生物陶瓷降解产物再沉积,蛋白多糖、粘多糖类细胞外基质和天然骨粘合物粘连沉积并引导钙盐沉积在界面上,测得该种植体各项技术指标优于目前单一材料种植体技术指标. 相似文献
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