Reconstruction Of Mandibular Segmental Detects Using Transport Disk Distraction Osteogenesis

Background: Distraction osteogenesis (DO) has become an important alternative for bone defect reconstruction. The study aims to investigate the clinical feasibility and efficiency of transport disc DO (TDDO) for reconstruction of segmental defect of mandible and further dental implant treatment.Methods: A serial of 6 patients diagnosed with ameloblastoma or keratocystic odontogenic tumor were included in this study. Computed tomography (CT) scanning and panoramic radiograph were performed for preoperative evaluation and surgery planning. Transport disc DO was applied simultaneously with tumor resection for reconstruction of mandibular defects. The postoperative panoramic radiographs and CT scans were taken for evaluation of the ossification level. Then a second surgery was performed for removal of the distraction apparatus. Bone graft and rigid internal fixation were also used to fill the gap between the transport disc and the stump of the residual ramus. Further dental implant treatment was also finished or in progress.Results: All patients finished the whole treatment period, and no distraction device failure or tumor recurrence occurred. The distraction length ranged from 35 to 48 mm and the whole treatment period of TDDO ranged from 21 to 33 weeks. High degree of ossification was confirmed at the end of treatment by postoperative radiographs and intraoperative observation. Infection occurred in 1 of the 6 patients, and the symptom was controlled by surgical dressing change and flushing. Results of final facial profile in all patients were good. Three patients finished dental implant treatment with good occlusion.Conclusion: Results in this study suggest the clinical feasibility and efficiency of TDDO for reconstruction of segmental defect of mandible and further dental implant treatment.