弧线式牵张成骨修复犬部分上颌骨的实验研究

目的:探讨应用内置弧线式骨牵张器实现颧骨弧线式牵张成骨修复部分上颌骨的可行性。方法:以犬建 立实验动物模型,制造上颌骨、颧骨节段性缺损,模拟上颌骨缺失,以内置弧线式骨牵张器牵张颧骨修复部分上颌 骨,共牵引约12mm,固定期X线观察。结果:2只犬实验内容均按计划完成,X线影像示,牵引结束时,骨移动盘实 现显著的改向、内旋,与远端颧骨呈弧线连接,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,新生骨骨质密度接近正常,与双侧正常骨质连续,弧线完整平滑,弧线式牵张成骨修复基本完成;器械始 终处于正常状态。结论:颧骨弧线式牵张成骨术和本文报告的内置弧线式骨牵张器具有临床应用可能性。

Arced Segmental Maxillary Regeneration by Distraction Osteogenesis of Zygoma:an Experimental Study on Dogs

Objective: To study the possibility of arced segmental maxillary regeneration by distraction osteogenesis of zygoma with an arced submerged device. Methods: The segmental maxilla and zygoma defects and the following distraction of the remained zygoma with the arced submerged devices were performed on dogs, the zygoma was distracted about 12mm, the process of bone formation was examined by X-ray. Results: Dogs and distractors were in good condition during the experimental period. Preliminary bone was found in 2 weeks, then with the bone formed continuously, bone formation around an arc was completed in 8 weeks. The distractors were in good condition. Conclusion: The arced segmental maxillary regeneration by distraction osteogenesis of zygoma for maxilla with the arced submerged device are meaningful and practicable.