Abstract
Methods of evaluating the need for orthognathic surgery during orthodontic treatment was investigated by comparing two similar cases of skeletal class III malocclusion.
Cephalometric analysis of the maxillary and mandibular skeletal positions is essential in determining the need for surgical orthodontic treatment. However, surgery in some borderline cases is optional.
Cephalometric analysis indicated that case 1 should be treated by orthognathic surgery, while case 2 should be corrected by orthodontic treatment only. The effect of surgical and non surgical treatment on ANB, APDI, AB-MP, Wylie's assessment, and AO-BO was evaluated.
The following results were obtained:
1. Several analyses should be done in determinig the need for orthognathic surgery in the treatment of skeletal class III malocclusion.
2. Skeletal correction requires evaluation of the antero-posterior skeletal discrepancy and vertical discrepancy.
3. Dental correction requires evaluation of the inclination of the occlusal plane and relationship of the first molars.
4. Esthetic correction requires analysis of esthetics.
