Root canal file for rotary use for expansion of root canal of human or animal teeth in specified diameter and cone, has spiral cutting edges running longitudinal to root canal

摘要

The root canal file (1) has spiral cutting edges running longitudinal to the root canal. In the root canal file one of the cutting edges (2,3,4) is recessed in multiple cross section levels over the height with a specified length along the root canal file partially and alternatively with the other cutting edges with two cutting edges.