传送盘回复式牵引成骨修复山羊上颌骨缺损的实验研究

目的：结合上颌骨的解剖生理特点，探讨采用传送盘回复式牵引成骨修复上颌骨缺损的可行性。方法：11只成年山羊．随机分为实验组和对照组。其中实验组9只，按固定期不同分为1、2、3个月组，每组3只；对照组2只。实验组山羊通过手术制作上颌骨前部节段性缺损，缺损长度12～14mm，平均大小12．7mm。同期制作缺损前方传送盘并使之后退．关闭缺损区，安置牵引器，通过牵引将传送盘回复原位。术后7天开始牵引，每天2次，持续15～18d，每次0．4mm．采用大体、影像学及组织学观察缺损区愈合情况。结果：传送盘牵引复位后，缺损区被新生骨修复，X线、三维CT及组织学检查显示，新骨形成良好，新骨形成方式符合传统牵引成骨的成骨方式。结论：传送盘回复式牵引成骨符合上颌骨的解剖特点．具有一定的临床可行性。

Experimental study on distraction osteogenesis for reconstruction of maxillary defects with replacement of transplant disk in goats

PURPOSE:This study was aimed to set up a new method for reconstruction of maxillary defect with distraction osteogenesis through an animal experiment. METHODS: 11 adult goats were randomly divided into 2 groups (9 in the experimental group and 2 in the control group) in this study. 3 subgroups were set up in the experimental group based on the consolidation period. Other 2 goats were chosen as the control group. Maxillary defect was made firstly through partial maxillectomy for the experimental group. Length of the defects was from 12 to 14mm with an average of 12.7mm. A transport disc was then made through anterior Le Fort I osteotomy and it would be shifted backward for the closure of the defect. Only maxillary defect was made for the control group. Distraction was activated after a latency of 7 days at a rate of 0.4mm twice a day for 15-18 days. RESULTS: Bone defects in the maxilla were well repaired when the transport disc was distracted back to its original position. Radiology and histology demonstrated good new bone formation in the distraction gap. CONCLUSIONS: Transport distraction osteogenesis would be a reasonable method for reconstruction of maxillary defect. Supported by Shanghai Leading Academic Discipline Project(Y0203)and Shuguang Project of Shanghai Education Committee(02SG46).