Abstract: A mouthguard that has a body having upper and lower troughs conforming generally to the upper and lower arches. Liners of impression material are disposed in the respective troughs for conformance to the actual impressions of the teeth of the arches. The body has an occlusal wall that contains a series of spaced-apart air/saliva ducts extending in a lingual/buccal sense to establish lingual/buccal fluid communication. The liners are mechanically interlocked to the mouthguard body by interlocking material that extend along the edges of the respective troughs and also by integral connections which extend through the occlusal wall between the two troughs in bridging portions of the occlusal wall that separate the air/saliva ducts.

Abstract: Various embodiments of orthodontic arch wires are disclosed. These embodiments comprise a metal part and a plastic part arranged so that the metal part faces teeth of the arch while the plastic faces labially. The arch wire is formed by an extrusion process wherein wire is extruded to a desired cross sectional shape and plastic is then extruded onto the metal. Various embodiments are configured for different cross sectional features. By making the plastic of a coloration matching the individual's teeth, an aesthetic benefit is obtained.