Background Mandibular premolar extraction of Class III patients needing orthognathic surgery might adversely affect their final profile. Methods This case report describes the successful application of mandibular symphyseal distraction osteogenesis (MSDO) followed by combination of nonextraction orthodontic therapy and orthognathic surgery to treat an 18-year-old man with severe skeletal Class III malocclusion with severe crowding in both dentition arch and unilateral crossbite. Results The mandibular arch expanded dentally and skeletally by MSDO without periodontal problem. By orthodontic therapy, the mandibular incisors were proclinated 10° and the maxillary incisors were retroclinated 6°, resulting in correction of anteroposterior dental compensation. Skeletal Class III tendency Class I jaw relationship with improved facial profile was achieved by impacted maxilla and mandibular setback. Conclusion Our case report suggests that use of MSDO expands the possibility of the presurgical orthodontic treatment with nonextraction for skeletal Class III orthognathic surgery case with crowding in mandibular dentition.
- Class III malocclusion
- Mandibular symphyseal distraction osteogenesis
- Surgical orthodontic treatment