Occlusal splint therapy in MPD and internal derangements of the TMJ.

Although occlusal splints are useful in the treatment of MPD and internal derangements, they must be used in a rational manner. Two basic appliances are employed in Phase I palliative therapy: a maxillary full coverage (MAR) and a mandibular orthopedic repositioning appliance (MORA). The MAR is used in MPD patients primarily to disengage the occlusion and reduce parafunctional activity. In many cases of internal derangement, protrusive mandibular repositioning is indicated. By using the MORA during the day and the MAR at night, the disadvantages of each appliance are minimized.