Electronic Thesis and Dissertation Repository


Master of Clinical Science




Dr. Ali Tassi

2nd Supervisor

Dr. Michael Shimizu

Joint Supervisor


Objective: To evaluate clinical and radiographic treatment outcomes after maxillomandibular advancement (MMA) surgery on subjects suffering from obstructive sleep apnea (OSA).

Materials and Methods: This was a retrospective cohort analysis. Subjects underwent pre- and post-surgical polysomnography (PSG) studies and were also asked to complete a subjective self-assessment via the Epworth Sleepiness Scale (ESS) questionnaire. Twenty-two patients (11 male, 11 female) met the inclusion criteria.

Results: The mean pre-surgical apnea-hypopnea index (AHI) score was 48.4 (+/-31.3) and mean ESS score was 11.6 (+/-4.6). After surgery, the mean AHI reduced to 14.0 (+/-15.0) and ESS reduced to 5.7 (+/-3.5). Treatment success was observed in 19 of 22 (86.4%) patients and 8 of 22 (36.4%) met the criteria for treatment cure.

Conclusions: MMA surgery is an effective treatment for patients suffering from OSA. Subjective sleepiness levels were significantly reduced after surgery. There were no pre- or post-surgical variables that acted as predictors of successful treatment.