重组人骨形成蛋白-2-珊瑚人工骨复合物在拔牙窝牙槽骨修复中的作用

目的:探讨重组人骨形成蛋白-2与珊瑚人工骨复合物(复合骨 )在拔牙窝修复中的作用。方法:拔除 12只成年狗两侧上颌第二及第三切牙,并去除牙槽窝之间的牙槽间隔,一侧随即植入复合骨,对侧植入珊瑚人工骨(珊瑚骨 )作为对照。并于植入后 4、8、12周取材,采用组织学观察、图像分析和 ⁹⁹Tc^m]-MDP核素骨显像等方法比较两种植入材料在牙槽窝中的骨修复能力。结果:复合骨植入牙槽骨后,材料被逐渐降解吸收,新骨不断生成,12周后,植入材料完全被成熟的骨组织取代;图像分析结果显示不同时间复合骨组新骨形成的比值显著高于珊瑚骨组(P <0.05 );4和 8周复合骨组核素浓聚程度高于珊瑚骨组,12周两组核素浓聚程度差异不明显。结论:复合骨在牙槽骨缺损中的骨修复能力和修复效果明显优于珊瑚骨.

Role of coral artificial bone composite of human recombinant bone morphogenetic protein-2 in repairing alveolar bone

AIM: This study was conducted to evaluate the bone repairing ability of coral artificial bone(CAB) composite of human recombinant bone morphogenetic protein-2(rhBMP-2-CAB) implanted into extraction sockets. METHODS: 12 adult dogs served as the experimental animals. Immediately after extraction of the upper second and third incisors, rhBMP-2-CAB and CAB were respectively implanted into each site of extraction sockets. The bone repairing ability of the two grafts was analyzed with histology, image analysis system and radionuclide bone imagining at 4th, 8th and 12th week, respectively. RESULTS: rhBMP-2-CAB were absorbed gradually after implanted into alveolar bone defect and were replaced completely by bone at 12 weeks. The ratio of new bone formation of rhBMP-2-CAB was significantly higher than that of CAB at different time( P< 0.05). The uptake of 99 Tc m]-MDP in rhBMP-2-CAB was higher than that of CAB at 4 and 8 weeks, but there was no difference between the two groups at 12 weeks. CONCLUSION: The bone repairing ability of rhBMP-2-CAB in extraction sockets are obviously better than that of CAB.