Abstract: A step-back eliminating tapered dental cutting instrument for improved root canal treatment and a method of root canal therapy in which the instrument includes a first tapered working portion having spiral-shaped cutting edges which define a first tapered angle, and a second tapered working portion having spiral-shaped cutting edges which define at least one second tapered angle. The second separate tapered angle may have a compound curve taper steeper at the distal tip of the instrument.

Abstract: A set of endodontic cutting instruments, each having handles and each having a different working tip diameter incrementally increasing in size from one instrument to the next. The set includes a first smaller standard size endodontic cutting instrument having a grasping end with a first color according to a standard color code, a second larger standard size endodontic cutting instrument having a grasping end with a second color according to the standard color code and a non-standard intermediate size endodontic instrument having a size between the first smaller standard size and the second larger standard size and having a grasping end with a color combination including a first portion having the first standard color corresponding to the first smaller standard size and a second portion having the second standard color corresponding to the second larger standard size. Nonstandard taper portions on the cutting instruments are provided to smooth stair step root canal cavities.

Abstract: A preformed posterior palatal seal (Preformed PPS) for use in preparation of dentures includes a body preformed of a predetermined Anatomically based size and shape of a posterior palatal seal (PPS) for sealing a denture at the "Ah line" of the human palate and adhesive for holding the preformed body to a denture impression prior to forming a mold from which a denture is to be formed.

Abstract: A preformed posterior palatal seal (Preformed PPS) for use in preparation of dentures includes a body preformed of a predetermined anatomically based size and shape of a posterior palatal seal (PPS) for sealing a denture at the "Ah line" of the human palate and adhesive for holding the preformed body to a denture impression prior to forming a mold from which a denture is to be formed.

Abstract: A set of endodontic cutting instruments, each having handles and each having a different working tip diameter incrementally increasing in size from one instrument to the next. The set includes a first smaller standard size endodontic cutting instrument having a grasping end with a first color according to a standard color code, a second larger standard size endodontic cutting instrument having a grasping end with a second color according to the standard color code and a non-standard intermediate size endodontic instrument having a size between the first smaller standard size and the second larger standard size and having a grasping end with a color combination including a first portion having the first standard color corresponding to the first smaller standard size and a second portion having the second standard color corresponding to the second larger standard size.

Abstract: A preformed posterior palatal seal (Preformed PPS) for securing to, anatonically based existing dentures includes a body preformed of a predetermined size and shape of a posterior palatal seal (PPS) for sealing an existing denture at the "Ah line" of the human palate and adhesive for holding the preformed body to a denture.