Patent ID: 8408901
Filing Date: 2013-04-02
Classification: A61C

Abstract:
1. An improved endodontic instrument for shaping or cleaning a root canal in a tooth comprising a file with one or more flutes spiraling along the length of the file, the one or more flutes having a first outer diameter at a shank end of the file, a second, smaller outer diameter at a tip end of the file, said first and second outer diameters conforming to a straight taper line between a shank portion and a tip portion of the file, the outer diameter of the flutes along an intermediate portion located between the shank portion and the tip portion of the file being less than the first diameter, and a cutting edge on a leading edge of the one or more flutes, wherein the flutes in the shank portion and the tip portion are landed flutes, non-landed flutes or a combination thereof, the improvement comprising: at least one region in the intermediate portion with flute diameters which are less than the straight taper line between the shank portion and the tip portion wherein the flutes in the at least one region in the intermediate portion are landed flutes and all the lands on the flutes in said one region in the intermediate portion have widths greater than the widths of the lands in the shank portion or tip portion.