nocturnai airway patency appliance (NAPA)...
The Nocturnal AIrway Patency Appliance (NAPA) is constructed in a dental laboratory of rigid acrylic and is tooth retained by Adam's clasps. An anterior positioned "breathing beak: allows for oral breathing when necessary. The mandible is held firmly in position to prevent any jaw movement during use and , thus, is non-adjustable. The vertical opening is 5 to 10mm.
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