A study of computer-based cephalometric analysis and prediction system in orthognathic surgery

ABSTRACT

Analysis and prediction on lateral cephalometric must be necessary to know present states and it is important to decide method and magnitude of real orthognathic surgery. The purpose of this study is to evaluate accuracy that post-surgical lateral cephalometric analysis compared with simulated surgical lateral cephalometric analysis using orthgnathic surgery prediction system (V-cephTM version 3.0). The result as follow Skeletal position change showed significantly difference between predicted and actual means. (12 of 19). Dental position change showed significantly difference between predicted and actual means. (5 of 9). The angles which were measured among three points showed significantly difference between predicted and actual means. (13 of 18). The distances which were measured between two points significantly difference between predicted and actual means. (4 of 8). None of 2 measurement for ratio showed significantly difference between predicted and actual means. Overall 17 of 28 measurements showed significant difference in means As the result of this study, it was inappropriate to apply prediction system in clinical situation. But the difference was not severe, prediction system could show out line of post-surgical result approximately. So, it is possible to predict the post-surgical result simply, and to explain the surgery to patient.