C-Pap Mask  Oral  Surgery   Positive Airway Pressure Is a highly effective therapy. It uses air pressure to prop the airway open during sleep. PAP machines work by pumping room air through a hose to a mask that fits over the nose or the nose and mouth. The mask is held in place with straps. The appropriate PAP pressure level is determined during a sleep study arranged by the sleep technician. C-Pap Machine C-Pap Mask