Changes of Condylar Movements after Orthognathic Surgery of Mandibular Prognathism using Sagittal Splitting Ramus Osteotomy.

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The purpose of this study was to investigate the changes of condylar movements after orthognathic surgery of mandibular prognathism using sagittal splitting ramus osteotomy (SSRO). Condylar path tracings were recorded for maximum opening, protrusion-retrusion, medial excursion and habitual masticatory movement of the mandible by means of a computer aided diagnostic axiograph.<BR>The following results were obtained.<BR>Case 1: A mandibular prognathism due to overgrowth of mandible was diagnosed in a 33-year-old female. After combined surgical-orthodontic treatment, each condylar path tracing coincided. In habitual masticatory movement, the rhythm of condylar movement became stable and the velocity of condylar movement increased. The difference of condylar position between RCP and ICP disappeared.<BR>Case 2: A mandibular prognathism was diagnosed in a 19-year-old-female. After orthognathic surgery, the distance of condylar path tracing in protrusion and medial excursion movements increased and the asymmetry of condylar movement was corrected in each condylar path tracing. The rate of condylar movement in habitual masticatory movement increased.<BR>These two cases indicated that surgical orthodontic treatment for skeletal Class III case by means of a SSRO has favorable effects on the function of the condylar movements.
特定非営利活動法人日本顎変形症学会の論文