Claims
- 1. A dental drill comprising, a tip, an elongate drill body tapered to said tip, said drill body having a plurality of barbs projecting outwardly from the drill body and arranged helically about the drill body, the barbs each having an outer peripheral profile resembling a parabola in shape extending generally toward said tip, each barb having a flat surface contiguous with a corresponding flat surface of an adjacent barb, each flat surface of the barbs being disposed in a common helical path about the drill body and each having a shape resembling a parabola projecting outwardly from the drill body, and each barb having a shape resembling a paraboloid in which crossections defined by intersections by planes parallel to the corresponding flat surface thereof and spaced axially on the drill body resemble parabolas with axes thereof decreasing in length as the intersections are made in a direction toward said tip.
- 2. A dental drill according to claim 1, in which said common helical path has a constant pitch.
- 3. A dental drill according to claim 1, in which said tip is conical.
- 4. A dental drill according to claim 1, in which each flat surface of a corresponding barb is contiguous to adjacent flat surfaces at points of juncture to the drill body.
- 5. A dental drill according to claim 1, in which said barbs are substantially identical.
Priority Claims (1)
Number |
Date |
Country |
Kind |
85 00485 |
Jan 1985 |
FRX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/070,090, filed July 6, 1987 and now abandoned, which is a continuation of application Ser. No. 06/799,359 filed Nov. 18, 1985, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
322265 |
Donaldson |
Jul 1885 |
|
717594 |
Miles et al. |
Jan 1903 |
|
4538989 |
Apairo et al. |
Sep 1985 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
478886 |
Dec 1927 |
DE2 |
Continuations (2)
|
Number |
Date |
Country |
Parent |
70090 |
Jul 1987 |
|
Parent |
799359 |
Nov 1985 |
|