Obwegeser II Osteotomy for Treatment of Severe Mandibular Protrusion. Report of a Case.

概要

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Obwegeser II method was applied to an 18-year-old male patient with severe progenia and open bite. The reasons for selecting this method were as follows; 1. His lateral cephalometric analysis revealed only excessive mandibular protrusion without any maxillary abnormality. 2. It was necessary for the mandible to be set back 14 mm posteriorly to obtain the ideal intermaxillary occlusion. 3. The anteroposterior width of his mandibular ramus was bilaterally narrow. 4. Furthermore, severe open bite still remained at the end of pre-surgical orthodontic treatment. Postoperative cephalometric analysis revealed both skeletal stability and harmonious balance. One of the advantages of this method is that a bigger contact area can be obtained between the two separated bone segments compared with that of sagittal split ramus osteotomy when the width of the mandibular ramus is narrow. In addition, it was suggested that a longer distance between the mandibular second molar and the anterior edge of the mandibular ramus could be a good indication for this operation.
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