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Main Instructor Bing-Luen Yang
Yu-Feng Chen
Ching-Ling Huang
Szu-Ting Chou
Yu-Chuan Tseng
Department / Institution Department of Orthodontics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
Classification Case report
  Obstructive sleep apnea (OSA) is a worldwide disorder, which is approximately 6% in women aged from 30 to 70 years old. The apnea-hypopnea index (AHI) is the most important criterion to classify OSA patient into different degrees and lead to different treatment protocols. Some reports recommended to process maxillomandibular advancement surgery (MMA) in moderate to severe OSA patients could be an effective treatment method. Moreover, with the simulation of virtual surgery on the computer, we could achieve our goal precisely. 
  A 23 year-old female patient had received tonsillecotmy, uvulopalatopharyngoplasty (UPPP), nose laser surgery and orthodontic treatment before, but the symptom was not improved. Her AHI was 73.1 times/hour and the minimum SpO2 was only 41%, classified as a severe OSA case. The patient was skeletal Class II jaw relation with mandibular deficiency, hyperdivergent facial pattern, dental Class II malocclusion, midline deviation and occlusal plane canting. We planed to take orthodontic treatment combined with MMA surgery. With the help of surgical virtual simulation on the computer, we could adjust both jaws in all aspects easily with customized surgical splints.
  This MMA surgery will counter-clockwisly rotate the occlusal plane for increasing nasopharyngeal space and make yaw and roll rotation at the same time. With the computer-assisted simulation surgery, the difficulty we faced would be clear at a glance on the computer.
An Obstructive Sleep Apnea Patient Treated with Maxillomandibular Advancement Surgery by Computer-assisted Simulation Surgery: A Case Report.