Dental drill and method for producing same

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.