下顎枝矢状分割法を施行した骨格性下顎前突患者における術後１５年以上にわたる顎態の変化について

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  • A Study on Dentofacial Changes for more than Fifteen Years after Sagittal Splitting Osteotomies in Skeletal Class III Patients

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The purpose of this study was to clarify the longterm dentofacial changes after sagittal splitting osteotomies in skeletal Class III patients.<BR>The lateral cephalograms of 7 females observed for more than fifteen years after surgery were used. The postoperative changes in the position of Pogonion were measured.<BR>The results were as follows:<BR>1) From five years to fifteen years after surgery, Pogonion moved antero-posteriolly and vertically. However, five patients who had stable occlusion revealed less displacement.<BR>2) Pogonion of two patients showing some relapse occlusion-wise moved more backwardly and downwardly from two years postoperatively to more than five years postoperatively. Some continuous positional changes of Pogonion was observed even fifteen years after surgery.<BR>The less Pogonion displacement was, the more stable the occlusion was. However, when greater Pogonion displacement is observed, the patient should be given more careful postoperative management.

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