The International journal of prosthodontics
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The effectiveness of an appliance for the treatment of obstructive sleep apnea (OSA) shows inordinate interindividual differences. Also, its therapeutic effects still remain unresolved. This study examined and compared the effects of a mandibular advancement splint (MAS) on the masseter and submental muscles of patients with mild and moderate OSA. ⋯ The MAS activated the masseter and submental muscles during sleep and prevented the upper airway from collapsing. The prosthetic appliance was useful in the treatment of both mild and moderate OSA syndrome.