| 摘要 |
In a dental root canal instrument which comprises a working part 1 provided with cutting edges, the working part being provided with one or more cutting edges 2 distributed around the circumference of the working part in the cross section thereof, and the instrument having a free end of the working part 1 designated as a tip 3, the tip 3 being formed as a rounded cap, and wherein a portion of the working part 1 which follows the tip 3 is designed over a length designated as a guide section 7 such that material is removed exclusively within a range of not more than 180° of the circumference thereof, the invention suggests that the working part 1 should comprise, as a rule, two or more helically extending cutting edges 2, with only one cutting edge 2 being arranged in the guide section 7 and the guide section 7 towards the tip being of a more tapering conicity than the remaining working part 1. As for the method, it is suggested that a cylinder should first be produced which is ground to obtain a blank, the blank being subjected in subsequent working steps to a deep-grinding process for forming the cutting edges 2. |
