Patent ID: 9066773
Filing Date: 2015-06-30
Classification: A61C

Abstract:
1. A dental rotary drive cutting tool, comprising: a cutting portion formed on a tip side, a shank formed in a base, and a neck part formed between the cutting portion and the shank; wherein the neck part comprises a tapered portion, which is wider on the tip side and narrower on a side closer to the base, and the neck part includes a straight portion, which has a constant thickness along the length of the straight portion and a smooth surface; wherein the straight portion has a diameter equal to a diameter of an end of the tapered portion on the side closer to the base, and the neck part includes a connecting part between the straight portion and the shank, which gradually becomes thicker towards the shank, wherein a length of the straight portion is 0.5 to 2.0 mm.