:A Case Report

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Progressive condylar resorption (PCR) has been identified as a major problems in the outcome of orthognathic surgery. In order to prevent postoperative PCR, a patient with severe retromandible underwent mandibular lengthening using distraction osteogenesis with intraoral devices. An occlusal splint was simultaneously used during the distraction and consolidation period for the management.<BR>The patient was a 27-year-old female. Mandibular body osteotomy was performed in the angle region. The vector of distraction was parallel to the occlusal plane. The latency period was 7 days. The distraction rate was 0.8mm/day (0.4mm twice daily) for 18 days and the mandible was lengthened approximately 14mm in total. After 30 days of stabilization, the intraoral devices were removed. Enough osteogenesis was confirmed, and Le fort I type osteotomy and genioplasty were performed. Post-operative PCR has not manifested so far. Clinical and radiographic examination revealed no marked changes in the occlusion and profile at 14 months after distraction.
特定非営利活動法人日本顎変形症学会の論文