Three dimensional repositioning and fixation of the external fragments of mandibular ramus in sagittal split ramus osteotomy of the mandible. Part 3. Observation of postoperative mandibular position.:Part 3 Observation of postoperative mandibular position

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We have already reported an exact three-dimensional repositioning technique for the external ramus fragment in sagittal split ramus osteotomy using screw fixation. Eight prognathism patients underwent the operation with this repositioning technique, and changes in the external ramus fragment were studied using lateral, frontal, and axial radiograms taken befc, re and six weeks, six months and one year after the operation.<BR>When the status was compared before and six weeks after the operation, it was found that the external fragment had repositioned exactly in the antero-posterior direction, but that the gonion had shifted 1.3±4.3 mm laterally and the condyle had rotated 1.0±3.1° laterally. In one year of postoperative follow-up, the external fragment rotated slightly to the posterior direction while returning to the medial direction, but the condyle shifted laterally.<BR>These results revealed that our repositioning technique is effective for repositioning of the external ramus fragment in sagittal split ramus osteotomy and is particularly accurate in the antero-posterior direction.
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