| 摘要 |
The invention relates to a root canal instrument having a shaft 1 being connected to a neck 2 , a head 4 having at least one cutting edge 3 being arranged at the free end thereof, wherein the cutting edge 3 along the head 4 is provided with a positive twisting angle from a region facing the tip 5 of the head 4 and a negative twisting angle in a region facing the neck 2.
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