Abstract: Objective To observe the therapeutic efficacy of silensor in obstructive sleep apnea syndrome(OSAS).Methods 17 patients with OSAS were treated with mandibular advancement appliance named silensor and re-examined by PSG monitoring equipment at night.The changes in the sleep disorder indexes were analyzed.The upper airway structure were determined by CT before and after treatment.Results 17 patients responded to the appliance therapy.There were significant increases in upper airway area from 0.82 to 1.70 cm² and in upper oral-pharynx area from 1.24 to 1.93 cm² at average.However,the HI,Apnea index and AHI significantly decreased(P<0.05).Conclusion The silensor is an effective alternative that could benefit the patients with mild OSAS.

Key words: silensor, obstructive sleep apnea syndrome, upper airway, CT, multipleleds sleep monitor