# US 10,117,723 B2 · Dental drill and method for producing same

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- Number: US 10,117,723 B2
- Document ID: US10117723B2
- Status: Granted
- Kind: B2
- Application number: 15/697,595
- Filed: 2017-09-07
- Published: 2017-12-28
- Granted: 2018-11-06
- Earliest claimed: 2011-01-27
- Applicants: Arno Friedrichs
- Inventors: Arno Friedrichs
- Web page: https://patentgrep.com/patent/US10117723B2

## CPC

- A61C 1/055: {through the working tool, e.g. hollow burr}
- A61C 3/02: Tooth drilling or cutting instruments; Instruments acting like a sandblast machine
- B23B 51/06: Drills with lubricating or cooling equipment {(B23B51/042 takes precedence)}
- B23P 15/32: twist-drills
- B22F 2998/00: Supplementary information concerning processes or compositions relating to powder metallurgy
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER

## Abstract

A method produces a dental drill that has a shank and a work section. The shank contains a centrally arranged, continuous first channel. The work section contains one or more continuous, spiral-shaped further channels. The first channel and the further channels open into a common chamber connecting the shank and the work section. The shank is sintered with the work section in order to form a one-piece, sintered component that encloses the chamber connecting the shank and the work section.

## Claims

### Claim 1

Method of producing a dental drill having a shank and a work section, wherein the shank has a centrally arranged, continuous first channel and the work section has one or more continuous, helically extending further channels, the first channel and the further channels opening into a common chamber connecting the shank and the work section, wherein the common chamber is broader than the continuous first channel, comprising the following steps:
producing the shank having a centrally arranged, continuous first channel and
producing the work section having one or more continuous, helically extending further channels,
wherein the shank and the work section are produced independently of one another and
sintering the shank to the work section to form a one-piece, sintered component which encloses the chamber connecting the shank and the work section,
wherein for producing the shank a plastic material is extruded by a first extrusion tool in order to provide a first body, which comprises plastic material, with a centrally arranged, continuous first channel, the body leaving the first extrusion tool is cut to a predetermined first length and the cut-to-length body is hardened by drying,
wherein for producing the work section a plastic material is extruded by a second extrusion tool in order to provide a second body, which comprises plastic material, with rectilinearly extending further channels, the second body leaving the second extrusion tool is cut to a predetermined second length, the cut-to-length second body is subjected to a uniform twisting of a rolling motion, the speed of which changes linearly and constantly over the entire length, and the twisted body is hardened by drying, and
wherein the bodies hardened by drying are placed against one another in axial direction and the bodies placed against one another are heated in such a manner that the mutually adjoining surfaces thereof are melted so that the mutually adjoining surfaces are sintered together.