Abstract: A pair of U-shaped dentition trays are joined by a bendable bridging member that is reinforced by molded portions that function to maintain the trays biased apart and in tooth contact in a person's mouth.

Abstract: A bridging member pin supported above a dental impression, has an easily frangible, bendable and twistable end portion permitting a variety of angular dispositions of a tapered dowel relative a dental impression cavity.

Abstract: A pair of arcuate concavo-convex trays formed of a plastic foam material shaped to be inserted into the mouth and to encase both the upper and lower jaws. The trays are normally disposed in mirror-like opposition and joined anterior-to-anterior by a bridge member adapted to bow, bend or fold so that the exterior surfaces of the trays are juxtaposed bottom to bottom. The trays are used to receive and contain a medicament for topical application to a person's teeth, fluoride gel being a typical topical material.

Abstract: This instrument is a dental hand piece having an angularly disposed working end provided with an easily rotated broad-faced but thin tamping or packing tool for forcing packing material such as cord or yarn strands into the sulcus or gingival crevice between a tooth and the crest of the gingival or gum tissue surrounding the tooth.