富血小板纤维蛋白骨诱导动物模型的建立

Construction of animal models induced by platelet-rich fibrin

背景:目前许多研究将富血小板纤维蛋白联合其他骨替代材料用于种植体周围骨缺损和上颌窦提升,但尚缺乏富血小板纤维蛋白单独修复临界性骨缺损方面的研究。目的:对比富血小板纤维蛋白、Bio-Oss骨替代品、自体骨松质3种骨替代材料修复骨缺损的效果。方法:在Beagle犬股骨髁内侧制成4处直径6.0 mm、深度10.0 mm的圆柱形临界性骨缺损,其中3处分别植入自体富血小板纤维蛋白、Bio-Oss骨替代品、自体骨松质,以不植入任何物质的为空白对照组。术后12周进行骨缺损区X射线及Micro-CT检测。结果与结论:1X射线:富血小板纤维蛋白组密度较高,略微低于周围正常骨组织;Bio-Oss骨替代品组密度较低,但仍高于周围骨组织;自体骨松质组密度较高,接近周围骨组织;空白对照组呈明显的圆形低密度影。2Micro-CT:富血小板纤维蛋白组与自体骨松质组相似,较周围正常骨组织密度稍低,清晰可见较规律排列的骨小梁,无明显界面;Bio-Oss骨替代品组呈高密度影,界面较清;空白对照组仍然清晰可见骨缺损区,呈低密度影像。富血小板纤维蛋白组、自体骨松质组骨体积分数、骨小梁数目均高于Bio-Oss骨替代品组(P<0.05)。表明富血小板纤维蛋白具有与自体骨相似的骨修复效果。

BACKGROUND： At present, many studies have focused on platelet-rich fibrin combined with other bone substitute materials in repair of peri-implant bone defects and sinus lifting, but there is still a lack of research about the platelet-rich fibrin alone in repair of critical-size bone defects. OBJECTIVE： To compare the effect of three kinds of bone substitutes, platelet-rich fibrin, Bio-Oss bone substitute and autogenous cancellous bone, in repair of bone defects.METHODS： Four areas of cylindrical critical bone defects with a diameter of 6.0 mm and depth of 10.0 mm were prepared in the medial femoral condyle of beagle dogs. Three areas of bone defects were implanted with autologous platelet-rich fibrin, Bio-Oss bone substitutes and autologous cancellous bone, respectively. The remaining one area of bone defect was not implanted any substance, as control group. X-ray and Micro-CT detections in bone defect area were conducted after 12 weeks of surgery. RESULTS AND CONCLUSION：（1） X-ray： the density of platelet-rich fibrin group was more higher, but still slightly lower than that of the surrounding normal bone tissue; the density of the Bio-Oss bone substitute group was more lower, but still higher than that of the surrounding bone tissues; the density of autologous cancellous bone group was more higher, which was close to that of the surrounding bone tissues; circular low-density images were visible in the control group.（2） Micro-CT： platelet-rich fibrin group was similar with the autogenous cancellous bone group, and their density was slightly lower than that of the surrounding normal bone tissues; the trabecular bone exlibited a clear regular arrangement, and no obvious interface; the Bio-Oss bone substitute group showed a high density image with clear interface; the bone defect area was still clearly visible in the control group, with a low-density image. The bone volume fraction and trabecular number in the platelet-rich fibrin and autologous cancellous bone groups were both higher than those in the Bio-Oss bone substitute group（P 〈0.05）. These results demonstrate that platelet-rich fibrin and autogenous cancellous bone have a similar bone repair effect.