Accuracy of video imaging for predicting the soft tissue profile after mandibular set-back surgery.

The purpose of this study was to compare the accuracy of two video-imaging programs for predicting the soft tissue outcomes of mandibular set-back surgery for patients with skeletal class III malocclusion. The sample consisted of 30 previously treated, nongrowing, white patients who had undergone isolated mandibular set-back surgery. An objective comparison was made of each program's cephalometric prediction using a customized analysis, as well as a subjective comparison of the predicted images as evaluated by a panel of six raters. The results showed that both programs produced similar cephalometric and video image predictions. The cephalometric visual treatment objective predictions were found to be most accurate in the horizontal plane; approximately 30% of cases showed errors greater than 2.0 mm, whereas in the vertical plane, the error rate was greater (50%). The resulting video image predictions were judged by the panel as being in the "fair" category. A particular problem was noted when significant vertical compression of the soft tissue images was required. Video imaging was suitable for patient education but not accurate enough for detailed diagnosis and treatment planning.