目的：评价富血小板纤维蛋白（PRF）构建的组织工程骨，在颊侧骨壁缺损修复中的成骨作用。方法：体外将PRF作用于比格犬的骨髓间充质干细胞（BMSCs），第21天测定钙结节量；4、7、11 d时采用实时定量PCR法检测成骨相关基因。9只成年比格犬拔除上颌左右两侧的侧切牙，构建颊侧骨壁缺损的拔牙位点，并随机分为血凝块组、PRF组和组织工程骨组，在手术后即刻、6周及12周时评价各组的颊侧骨高度和拔牙窝的骨密度。结果：PRF在体外实验中能明显促进BMSCs的增殖，提高成骨分化以及钙化能力（P<0.05）。动物实验中，PRF表现出了促进早期伤口愈合的能力。在颊侧骨壁缺损的修复中，组织工程组在6周时骨高度和骨密度分别为（2.63±0.57） mm、（765.19±59.70） HU，较血凝块组[（5.65±2.91) mm、（599.08±53.88） HU]和PRF组[（4.14±1.16) mm、（644.76±65.39） HU]显著增高（P<0.05）。结论：PRF复合BMSCs构建的组织工程骨可以在早期有效地修复拔牙窝骨壁缺损。%Objective: To evaluate platelet-rich fibrin (PRF) scaffolds and BMSCs in repairing mandibular buccal bone defects at canine′s tooth sockets. Methods:Fabrication of PRF were combined with beagle′s BMSCs scaffolds in vitro, and in day 21, calcium nodules were detected. Real time PCR were performed at days 4, 7 and 11. Nine adult beagle dogs were used to extract the left and right maxillary lateral incisor in vivo forming buccal bone defects. Dogs were randomly divided into 3 groups:blood clots group, PRF group and bone tissue engineering group. Evaluating buccal bone height in each group and the extraction socket bone density were performed at four time points: immediately after surgery, 6 week and 12 weeks later respectively. Results: In vitro, the PRF increased the BMSCs proliferation and significantly improve the ability of osteogenic differentiation and calcification(P<0.05). In animal experiments, PRF showed early healing wound ability. On repairing bone defects, at 6 weeks in the tissue engineering group, the bone hight [(2.63 ±0.57) mm] and bone mineral density [(765.19±59.70) HU] was significantly increased (P<0.05), which compared with blood clots group [(5.65± 2.91) mm, (599.08 ±53.88) HU] and PRF group [(4.14 ±1.16) mm, (644.76 ±65.39) HU]. Conclusion: Cooperative of PRF and BMSCs can effectively repair mandible alveolar bone defects in canine model.
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