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Chinese Journal of Dental Research

Year 1998
Volume 1 , Issue 1

Pages: 59 - 65

Cephalometric Analysis in Patients with TMJ Ankylosis and Obstructive Sleep Apnea Syndrome


Objective: Facial skeletal morphology and oropharyngeal soft tissue profiles were studied in 12 patients with TMJ ankylosis and obstructive sleep apnea syndrome and 18 asymptomatic controls. Method: Cephalometric analysis was used to profile the skeletal and soft tissue characteristics. Results: The position of the facial skeleton is more posterior and superior in patients than in controls; mandibular retrognathia is remarkable, and the perpendicular distance between the hoid bone and the mandibular plane was larger in patients than in controls. The pharyngeal airway space in patients is significantly reduced anteroposteriorly, especially between the base of the tongue and the posterior pharyngeal wall (p < 0.001). The sagittal area ratios of tongue and soft palate to oropharyngeal cavity are larger in patients than in controls (P < 0.001). Conclusions: The two parameters (PAS and TSA/OPA) are highly recommended as diagnostic aids in patients with obstructive sleep apnea syndrome, especially when surgical intervention is considered. The key points in treatment are to advance the jaw and to enlarge the oropharyngeal cavity.



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