Endodontic instruments with offset centers of mass

  • US 9,351,803 B2
  • Filed: 02/26/2015
  • Issued: 05/31/2016
  • Est. Priority Date: 04/08/2005
  • Status: Active Grant
First Claim
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1. An endodontic instrument for preparing an endodontic cavity space, the endodontic instrument comprising:

  • a shank configured for attachment to a motor to drive the endodontic instrument about a first axis; and

    a body extending from the shank by a length, the body being solid and having a tip end and a shank end and a working surface between the shank end and the tip end, the working surface including multiple edges, at least a portion of the body with the working surface being tapered such that the tip end has a diameter that is less than a diameter of the shank end, the body comprising a plurality of transverse cross-sections, each transverse cross-section of the body having a center of mass and multiple sides, the body having a center of mass path defined by the centers of mass of the plurality of transverse cross-sections of the body, each side of the multiple sides intersecting two edges of the multiple edges, wherein at least a portion of the center of mass path between the tip end and the shank end spirals around the first axis along a length of the first axis, and wherein the body is configured such that when the endodontic instrument is driven within the endodontic cavity space about the first axis, at each transverse section of at least a portion of the length of the body, one or more edges of the multiple edges are out of contact with a wall of the endodontic cavity space.

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