Patent ID: 9662181
Date: 2017-05-30
CPC Classifications: A61C

Claim:
1. An endodontic instrument for preparing an endodontic cavity space, the instrument comprising: a shank configured for attachment to a motor to rotate the instrument about an axis of rotation; and a body extending from the shank, the body having a shank end where the body extends from the shank and a tip end opposite of the shank end, the body having a working surface between the shank end and the tip end, the body having a single constant taper from the shank end to the tip end such that the tip end has a diameter that is less than a diameter of the shank end, the working surface including a plurality of helices, each helix of the plurality of helices including a helix cutting edge, each helix cutting edge spiraling around the body in a first direction of rotation along the working surface, each helix cutting edge having one or more cross cuts therein, the one or more cross cuts spiraling around the body in a second direction of rotation along the working surface, the second direction of rotation differing from the first direction of rotation, wherein the body comprises a plurality of transverse cross-sections, each transverse cross-section of the body having a center of mass, the body having a center of mass path defined by the centers of mass of the plurality of transverse cross-sections of the body, wherein at least a portion of the center of mass path between the tip end and the shank end spirals around the axis of rotation along a length of the axis of rotation.