Using an oral Appliances with CPAP

Q: Can an appliance be used with CPAP successfully?

Dr. Smith: At the same time? Yes, it’s called combination therapy, and
allows a CPAP user to have the pressure reduced to make it easier to
use. They can also be used alternately when they are hunting, on
airplanes, etc.. Of course, the right type of mask would need to be
used, and preferably one of the nasal cone type that does not place
any retrusive forces on the maxilla.

Another use for combination therapy is if you would like to prevent
any potential occlusal (bite) changes with the mandibular advancement
devices. If someone wears a MAD during the week, and CPAP on weekends,
for example, they will get no bite changes.