Abstract: An endodontic instrument adapted to be axially reciprocated within a root canal to remove material from walls of the root canal. The endodontic instrument includes an elongate shaft and a working portion. The elongate shaft includes a proximal end adjacent a handle and a distal end terminating at a tip spaced from the proximal end by the length of the instrument. The working portion includes a first helical fluted cutting surface for removing material from the walls of a root canal and a second helical fluted cutting surface for removing material from the walls of a root canal. The first helical fluted cutting surface and second helical fluted cutting surfaces are formed in opposing left-hand and right-hand directions such that material is removed form the walls of a root canal when the instrument is rotated in either a first or a second direction.

Abstract: An endodontic instrument adapted to be axially reciprocated within a root canal to remove material from walls of the root canal. The endodontic instrument includes an elongate shaft and a working portion. The elongate shaft includes a proximal end adjacent a handle and a distal end terminating at a tip spaced from the proximal end by the length of the instrument. The working portion includes a first helical fluted cutting surface for removing material from the walls of a root canal and a second helical fluted cutting surface for removing material from the walls of a root canal. The first helical fluted cutting surface and second helical fluted cutting surfaces are formed in opposing left-hand and right-hand directions such that material is removed form the walls of a root canal when the instrument is rotated in either a first or a second direction.

Abstract: A machining apparatus and method for fabricating endodontic instruments adapted for use in performing root canal procedures is disclosed. The machining apparatus includes computer numerical control (CNC) machining that automates much of the fabrication process. The disclosed machining apparatus and method is programmable to efficiently produce varying configurations of endodontic instruments on the same machining apparatus.

Abstract: A set of endodontic instrument adapted to remove material from walls of a root canal having a working portion with a relatively short working length. A substantially untapered nonworking portion of the instrument shaft with substantially parallel sidewalls and a diameter substantially the same as the diameter of the proximal end of the working portion extends from adjacent a proximal end of the working portion to the proximal end of the shaft. The working portions of the set of instruments have relatively small, slowly progressing taper rates.

Abstract: An endodontic instrument with an elongate shaft and a plurality of inverted frusto-conical sections with radial cutting edge disposed along a working portion of the shaft.

Abstract: An endodontic instrument with an elongate shaft and a plurality of inverted frusto-conical sections with radial cutting edge disposed along a working portion of the shaft.

Abstract: A method and instrument for removing material from an internal portion of a tooth wherein the tool used to remove the material includes an elongate shaft extending from a first end to a second end; a cutting surface extending along a working portion of the elongate shaft; a handle attached to the first end of the elongate shaft, the handle including a first end and a second end; a projection attached to the elongate shaft and extending around a portion of the perimeter of the shaft substantially adjacent to the first end of the handle, wherein the projection provides a barrier to prevent a user's fingers from moving beyond the handle directly onto the elongate shaft.

Abstract: An endodontic instrument with an elongate shaft and a plurality of inverted frusto-conical sections with radial cutting edge disposed along a working portion of the shaft.

Abstract: An endodontic instrument adapted for use in performing root canal therapy. The instrument includes a holder with a grip sized to be gripped by a hand of a user. An arm extends from the grip and has a length sufficient to permit a free end portion to reach into a patient's mouth while the grip remains outside the mouth. An elongate rod with a working portion having cutting portions thereon extends along the length of the arm of the holder such that a proximal end of the rod is adjacent the grip of the holder and the distal end of the rod with the working portion thereon extends from the free end portion of the arm, such that the working portion may be used to treat a root canal in a patient's mouth by a dentist manipulating the holder outside the mouth of the patient.

Abstract: An endodontic instrument adapted for use in performing root canal therapy. The instrument includes a holder with a grip sized to be gripped by a hand of a user. An arm extends from the grip and has a length sufficient to permit a free end portion to reach into a patient's mouth while the grip remains outside the mouth. An elongate rod with a working portion having cutting portions thereon extends along the length of the arm of the holder such that a proximal end of the rod is adjacent the grip of the holder and the distal end of the rod with the working portion thereon extends from the free end portion of the arm, such that the working portion may be used to treat a root canal in a patient's mouth by a dentist manipulating the holder outside the mouth of the patient.

Abstract: A cutting board for food products which is composed of a plurality of abrasive conical inserts arranged in parallel rows on a support so that a knife blade may be drawn along the channel formed between adjacent rows to sharpen the knife blade on both sides by contact with the inserts. The inserts are separately fabricated and mounted in tapered openings formed through the support.

Abstract: A cutting board for food products which is composed of a plurality of abrasive conical inserts arranged in parallel rows on a support so that a knife blade may be drawn along the channel formed between adjacent rows to sharpen the knife blade on both sides by contact with the inserts. The inserts are separately fabricated and mounted in tapered openings formed through the support.