Changes in soft tissue profile after surgical correction of prognathic mandible

Sung, Sang Jin; Kim, Jae Seung; Moon, Yoon Shik; Park, Hyun Do

Abstract

The treatment plan for orthognathic surgery must be based on accurate predictions, and this can be produced the most esthetic results. Treatment of prognathic mandible in adult is usually orthognathic surgery using mandible set back, but mandible with retruded chin point os needed additional chin augmentation. In this case, the directions between mandible and chin point are different therefore, the prediction of soft tissue reactions must be modified. In this study, we materialize the patients who was taken orthognathic surgery due to prognathic mandible, 11each(Group A) was taken only Bilateral Sagittal Sprit Ramus Osteotomy (BSSRO), 9each(Group B) was taken additional advancement genioplasty. The lateral cephalometric radiography taken 8 months later after orthognathic surgery by this patients were used. The results of this study were as follows 1. The profile of lips was favorable after surgery due to upper lip to E-line became prominent and lower lip to E-line was retruded. 2. In both group, upper lip moved posteriorly and national angle was increased. 3. The ratio of the soft tissue profile change in POGs point to skeletal B point movement was 84% in group A and 66% in group B, and there was statistical significance between group A and group B. 4. Vertical movement of hard tissue points is decreased in group A.