颧骨牵张成骨修复上颌骨部分缺损的实验研究

目的:探讨用颧骨牵张成骨修复部分上颌骨缺损的可行性、科学性和规律性。方法:以犬建立实验动物模型,制造上颌骨颧突、颧骨节段性缺损,以内置式牵张成骨器牵张颧骨修复部分上颌骨,每次 1. 0mm, 1次 /d,连续 10d,共牵引 10mm,固定期X线观察。结果: 3只犬实验内容按计划完成,X线影像示,固定期 2周时,牵张间隙内早期骨结构形成,随后,骨密度进行性加强; 8周时,新生骨密度接近正常,与双侧正常骨质连续,骨缺损修复基本完成。结论:颧骨牵张成骨修复部分上颌骨具有临床应用可能性;颧骨牵张成骨实验动物模型切实可行,且受咬合力影响小,在某些领域可望获得更广泛的应用。

Repair of maxillary defect by distraction osteogenesis in zygoma in dogs

Objective:To study the feasibility of repair of partial maxillary defect by distraction osteogenesis(DO) in zygoma.Methods:Segmental maxilla- zygoma defect was made in 3 dogs. A submerged DO distractor was anchoraged on the zygoma and maxilla across the defect,the zygoma was distracted with a rate of 1.0 mm/d for ten days,the process of bone formation was examined by X-ray.Results:All dogs were in health condition within the experimental period.New bone formation was observed 2~4 weeks after operation. Complete repair of the defects was observed 8 weeks after the completion of distraction.Conclusion:The partial maxillary defect may be repaired by DO in zygoma.