Patent ID: 7731498
Filing Date: 2010-06-08
Classification: A61C

Abstract:
1. An endodontic instrument for cleaning and extirpating a root canal, comprising an elongated shaft having a working portion having a plurality of flutes comprising at least a first flute and a second flute, the flutes having one or more tissue-removing edges, points and/or surfaces defined thereon, the first flute having a first axial taper angle with respect to the longitudinal axis of the working portion and the second flute having a second axial taper angle with respect to the longitudinal axis of the working portion, wherein the first axial taper angle is different than the second axial taper angle along at least a portion of the working portion, and further wherein a first facing surface of the first flute has a cross sectional profile shape and dimension substantially the same as a cross sectional profile shape and dimension of a second facing surface of the second flute at a first longitudinal point of the working portion and wherein the cross sectional profile shape or dimension of the first facing surface is different than the cross sectional profile shape or dimension of the second facing surface at a second longitudinal point of the working portion distal from the first longitudinal point.