Abstract
This paper describes a patient with microgenia and open bite who was treated by mandibular ramus distraction osteogenesis using an intraoral device.
The patient was a 21-year-old male. An osteotomy was performed in the mandibular ramus region according to Obwegeser's original method (1955).
The mandible was fixed for 4 days to permit callus formation. The mandible was then serially lengthened 0.8mm per day for 20 days, and the mandiblewas lengthened approximately 16mm in total.
Occlusion improved, and after 6 months of consolidation, the intraoral device was removed. Bone union was confirmed in X-ray examination. No marked changes in occlusion have been found after 11 months of follow-up by clinical and radiographic observation.
