骨髓基质细胞-牙根-珊瑚羟基磷灰石复合体体内再植的初步观察

目的:评价体外构建的骨髓基质细胞(BMSCs)、珊瑚-羟磷灰石支架(CHA)、牙根复合体植入体内后牙根周组织的再生情况。方法:体外分离纯化的狗BMSCs分别与牙根及CHA支架共培养形成复合体后植入体内生长,16周后取材,组织切片观察牙根周组织的再生情况。结果:实验组较对照组所不同的是:有更趋成熟、致密的牙槽骨生成;牙根与牙槽骨之间形成了清晰的软组织间隙———类牙周膜结构,主要由纤维组织、毛细血管组成。结论:BMSC-CHA-牙根复合物植入体内后有效促进牙周组织的再生;组织工程学方法促进牙周组织再生具有可行性。

Preliminary observation on the effects of implantation of BMSCs-root- CHA complex in dog

Objective:To evaluate the periodontal tissue regeneration effect of implantation of bone marrow stromal cells(BMSCs)-root-coralline hydroxyapatite(CHA) complex.Methods:BMSCs of beagle dogs were in vitro cultured on CHA scaffold and on tooth root surface respectively.Then BMSCs-root samples were inserted into BMSCs-CHA scaffolds to form BMSCs-CHA-root complexes.5 complexes were implanted on one side of mandible in each of the dogs 1 month after the 4th,5th and 6th teeth had been extracted.Root-CHA without BMSCs was implanted on another side as the control.All dogs were killed 16 weeks after implantation,and the periodontal tissue regeneration were observed histologically.Results:More new bone formation and more mature alveolar bone were observed in the test group than that in the control,and there was a clearly periodontal ligament-like tissue formation only in the test group.Conclusion:The complex of BMSC-root-CHA can improve the periodontal tissue regeneration.