Occlusal outcome in patients undergoing orthognathic surgery with internal fixation.

Fifty consecutive patients undergoing orthognathic surgery with internal fixation (IF) were studied retrospectively with a weighted Peer Assessment Rating (PAR) Index to assess occlusal outcome at the end of all active treatment, and compared with 50 patients who had undergone treatment for malocclusion by orthodontic means alone. In the surgically treated patients, the mean percentage reduction in the weighted PAR Index was 83% and 31 out of 38 patients (82%) were 'greatly improved'. This implies a high standard of treatment in terms of the occlusal outcome. There was no difference in the proportion of patients having a final weighted PAR Index of less than 10 and no significant difference in the final weighted PAR Index between the two groups. This suggests that the occlusal outcome is no different whether patients undergo orthognathic surgery or orthodontic treatment alone, and that excellent occlusal results can be achieved in patients undergoing orthognathic surgery with internal fixation.