Patent ID: 7955078
Filing Date: 2011-06-07
Classification: A61C

Abstract:
1. An endodontic instrument for preparing an endodontic cavity space, comprising: a shank configured for attachment to a motor to rotate about an axis of rotation; and a body extending from the shank having a shank end and a tip and tapering from the shank end toward the tip so that the tip has a diameter that is less than a diameter of the shank end, the body having a cutting surface extending between the shank end and the tip, with the axis of rotation extending from the shank end toward the tip, the body being substantially straight without bends along its longitudinal length when at rest, wherein the body is made of NiTi and has centers of mass at each transverse cross-section and the centers of mass at each transverse cross-section lie along a line to define a mass axis, wherein the mass axis is off the axis of rotation with the tip being further from the axis of rotation than the shank end and with the tip located no further from the axis of rotation than the diameter of the shank end such that, when the body is rotated, the body is configured to form a helical envelope of motion that displaces the body of the instrument from being substantially straight to being substantially helical.