Clinical Research Directory

Inclusion Criteria: * Age: ≥ 18 and ≤ 60 years. * Sex: both genders. * BMI: less than 32 kg/m2 * Patients with moderate (AHI = 15-30) and severe OSA (AHI \> 30) according to the clinical guidelines given by the American Academy of Sleep Medicine * Friedman tongue position III or IV. * Documented failure/refusal of attempts of conservative treatment measures (not limited to continuous positive airway pressure). * The presence of type II obstruction (oropharynx and hypopharynx). * Class I occlusion. Exclusion Criteria: * Age: \< 18 or \> 60 years old. * BMI: \>32 kg/m2 * Failure to attend postoperative follow-up polysomnography within 12 months of surgery. * Previous surgery to the base of the tongue or other surgical treatment of OSA. * Chronic pulmonary disease, or other previous oropharyngeal/laryngeal surgery. * Class II occlusion with receding mandible. * Huge lymphoid tissue of the tongue and/or lingual tonsil. * Symptom not suggestive of OSA and presence of central sleep apnea.