Obstructive sleep apnea [OSA] is an increasingly common disorder. It is caused by partial or complete obstruction of the upper airway during sleep that results in absent or diminished airflow in lungs. The treatment modalities consist of both surgical & nonsurgical methods. Various dental appliances are used increasingly in mild snoring as an alternative to surgery.  This article reviews the anatomic features and etiologic factors of OSA and diagnosis and possible treatment options specially on oral appliances in management of this disorder.
Key words: - Obstructive sleep apnea, Diagnosis, Management, Appliances