• Keishi Ishiguro, Tadaharu Kobayashi, Nobutaka Kitamura, and Chikara Saito.
• Division of Reconstructive Surgery for Oral and Maxillofacial Region, Department of Tissue Regeneration and Reconstruction, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
• Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009 Mar 1;107(3):343-9.

ObjectiveThe objective of this study was to assess the influence of factors of obesity and craniofacial morphology on the degree of obstructive sleep apnea syndrome (OSAS) in Japanese individuals.Study DesignThe subjects were 138 adult male patients who visited the Clinic for Snoring & Obstructive Sleep Apnea at Niigata University Medical and Dental Hospital with chief complaints of snoring and apnea. Standardized lateral cephalograms were taken at the first visit, and overnight polysomnography was carried out for evaluation of each subject before treatment.ResultsUnivariate and multivariate analyses were performed to investigate factors affecting the severity of OSAS. These analyses showed that obesity, skeletal conditions such as short mandibular body and mandibular retreat, size of the tongue and position of the hyoid bone, and shape of the airway were associated with the severity of OSAS.ConclusionIn Japanese male OSAS patients, skeletal abnormalities are thought to be the factors that most greatly affect severity of OSAS.

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