Patent ID: 7247020

Claim:
A drill set for a dental screw implant fixture with a self-tap comprising: a first drill including, a diameter at a point of a cutting blade substantially equivalent to a diameter of a tip of a bottom end of a screw dental implant fixture; a diameter at a back end of the cutting blade equivalent to or smaller than a maximum root diameter of a first male screw provided on an oral cavity side of the screw dental implant fixture; a length of the cutting blade being larger than an entire length of the screw dental implant fixture; and a second drill being a two-step taper drill including a diameter of a point of a cutting blade substantially equivalent to the diameter of a tip end of the screw dental implant fixture; a diameter of a back end of a tapered back end cutting blade substantially equivalent to the maximum root diameter of the first male screw provided on the oral cavity side of the screw dental implant fixture and smaller than a maximum crest diameter thereof; the tapered back end cutting blade having a taper substantially equivalent to a taper of the first male screw of the screw dental implant fixture from the back end of the cutting tapered back end blade in a length of from ⅕ to a substantially equivalent length of a length of the first male screw of the screw dental implant fixture; and a tapered tip end cutting blade adjacent to the tapered back end cutting blade and adjacent to a tip, the tapered tip end cutting blade being less parallel to an axis of rotation of the second drill than is the tapered back end cutting blade from a front end of the back end cutting blade to a tip end position having a diameter substantially equivalent to the diameter of the tip of the bottom end of the screw dental implant fixture.