Occlusal splints and the method of manufacturing the same

An occlusal splint sized and shaped to be worn on the upper arch of the mouth over the teeth, said occlusal splint being formed of two layers of resin, the upper layer molded to conform to the shape of the upper teeth and to be resiliently retained thereon, and a lower layer formed of a cold-cure resin built up on the upper layer, the lower surface of said lower layer shaped so that when the lower jaw is moved toward the upper arch with the condyls of the wearer in their retruded rest position the upper surfaces of the lower teeth will engage said lower surface of the splint at the same time and said areas of engagement of those teeth that are in engagement are all below the plane of the lowermost edges of said upper teeth.