Abstract: An endodontic file (10) has a handle (11) and a spiral cord (15) of helically wound metallic wire wound in a predetermined direction around a central metallic cord (13) formed between opposite ends of the central cord so as to form an integrated structure (18) of generally conical cross-section including a narrow tip end (17) and an opposite wider upper end (16) supported at the upper end by the handle. A flexible conical reinforcement (26, 31) supported by the handle covers an outermost layer of an upper portion of the spiral cord remote from the tip end, its lower end being of sufficiently low diameter to enter the root canal and dimensioned at its upper end to limit bending of the upper portion. An outer surface (20) of the spiral cord is configured for removing material from inside the root canal when the endodontic file is rotated in the predetermined direction.

Abstract: An endodontic file (10) has a handle (11) and a spiral cord (15) of helically wound metallic wire wound in a predetermined direction around a central metallic cord (13) formed between opposite ends of the central cord so as to form an integrated structure (18) of generally conical cross-section including a narrow tip end (17) and an opposite wider upper end (16) supported at the upper end by the handle. A flexible conical reinforcement (26, 31) supported by the handle covers an outermost layer of an upper portion of the spiral cord remote from the tip end, its lower end being of sufficiently low diameter to enter the root canal and dimensioned at its upper end to limit bending of the upper portion. An outer surface (20) of the spiral cord is configured for removing material from inside the root canal when the endodontic file is rotated in the predetermined direction.

Abstract: An endodontic file for a motorized rotary handpiece includes a coupler element for coupling to the handpiece, a central longitudinal flexible core including a central flexible cable supported by the coupler element, and a helical wire surrounding the core and extending toward a tip of the core opposite the handle end. The flexible core includes a first plurality of inner strands twisted together in a first direction and surrounded by a second plurality of outer strands twisted in an opposite direction. The tip of the core is chamfered and unbonded and protrudes beyond the helical wire at the tip whereby in use reversing a direction of rotation of the endodontic file after the tip of the core reaches the apex of the root canal, unwinds the outer strands, which operate as a brush during removal of the endodontic file from the root canal.

Abstract: An endodontic file for a motorized rotary handpiece includes a coupler element for coupling to the handpiece, a central longitudinal flexible core including a central flexible cable supported by the coupler element, and a helical wire surrounding the core and extending toward a tip of the core opposite the handle end. The flexible core includes a first plurality of inner strands twisted together in a first direction and surrounded by a second plurality of outer strands twisted in an opposite direction. The tip of the core is chamfered and unbonded and protrudes beyond the helical wire at the tip whereby in use reversing a direction of rotation of the endodontic file after the tip of the core reaches the apex of the root canal, unwinds the outer strands, which operate as a brush during removal of the endodontic file from the root canal.

Abstract: A root canal length measurement device configured for detachable support on a neck of a dental handpiece and having a generally cylindrical electrical contact element that, in use, is resiliently biased by a spring toward an endodontic file rotatably mounted in the handpiece so that a flat surface of the contact element maintains a steady electrical connection with a shank portion of the endodontic file proximate its point of attachment to the handpiece.

Abstract: A compact, portable rocking device for baby carriages and the like including a box-like housing arranged to be attached to a wall of the carriage; a circular, horizontally disposed plate disposed in the housing, an integral arm extending outwardly horizontally from the plate; a weight disposed on the arm; a miniature DC motor mounted in the housing coupled via transmission apparatus to the plate for rotation thereof; a switch for actuating and stopping the motor; and electronic apparatus for automatically activating the switch.