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为了探索下颌骨缺损重建的新途径,以8条犬为实验对象,Ⅰ期手术建立下颌骨体部2.0cm缺损模型,固定下颌骨重建钛板;Ⅱ期手术在骨缺损的近中骨段截骨形成1.5cm长传送骨盘,固定口内牵引器。经过10天的间歇期,以0.5mm/次的速度,每日2次,向恒定的方向行牵引传送骨盘通过缺损区,直到缺损区完全封闭。结果:①下颌骨缺损完全封闭,牵引间隙新生的软硬组织形态与自然下颌骨相同,触诊质地坚硬。②牵引完成后4周,牵引间隙出现X线阻射;牵引完成后8周,牵引间隙可观察到皮质骨形成。结论:在重建钛板引导下,口内双端式传送牵引成骨术开拓了下颌骨缺损功能性重建的新途径,为临床应用提供了实验依据。
In order to explore a new way to reconstruct mandibular defects, 8 dogs were selected as experimental object. The 2.0cm defect model of mandible body was established by stage Ⅰ operation and titanium plate was fixed by mandibular reconstruction. Bone formation 1.5cm long transmission pelvis, fixed intraoral retractor. After a 10-day interval, the pelvis was pulled in a constant direction at a rate of 0.5 mm / second twice a day through the defect area until the defect area was completely closed. Results: ① The mandibular defects were completely closed, and the morphology of soft and hard tissue of the newborn in traction gap was the same as that of natural mandible. ② After 4 weeks of traction, X-ray refraction occurred in the traction gap. Cortical bone formation was observed in the traction gap 8 weeks after the traction was completed. CONCLUSION: Under the guidance of reconstructed titanium plate, intraoral delivery of dual-ended traction osteogenesis opens up new ways of functional reconstruction of mandibular defects and provides experimental evidence for clinical application.