Dental apparatus for shaping and cleaning a root canal

A - Human Necessities – 61 – C

Patent

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A61C 5/02 (2006.01) A61C 1/00 (2006.01)

Patent

CA 2637949

Apparatus is disclosed for use in cleaning dental root canals using an endodontic file. The file is mounted in a drill head driven by an electric motor. The motor is normally driven in one, forward direction but periodically the motor rotation is reversed for a very short time. The duration of the motor reversal is so short that although the motor rotates in the reverse direction, the inertia and backlash in the transmission between the motor output shaft and the drill head is such that the direction of rotation of the file in the root canal is not changed.

La présente invention concerne un appareil à utiliser dans le nettoyage des canaux radiculaires à l'aide d'une lime endodontique. La lime est montée sur une tête de fraise entraînée par moteur électrique. Le moteur est normalement entraîné dans un sens, vers l'avant, mais la rotation du moteur est périodiquement inversée pendant une brève durée de temps. La durée de l'inversion du moteur est tellement courte que bien que le moteur tourne dans le sens inverse, l'inertie et le jeu d'entre-dents de la transmission entre l'arbre de sortie du moteur et la tête de fraise sont tels que le sens de rotation de la lime dans le canal radiculaire reste inchangé.

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