Axially elongate dental machining portion

An axially elongate dental machining portion, comprising:

• a machining region machinable by a dental machining device, and
• a fixing region for fixing the axially elongate dental machining portion to a holder of the dental machining device,
• wherein a fixing projection surface projects from the fixing region such that the fixing projection surface is oriented transversely relative to a longitudinal axis of the axially elongate dental machining portion such that, when the axially elongate dental machining portion is mounted in the holder, the fixing projection surface bears against a holding nose positioned in complementary relationship on the holder, the machining region having a machinable surface which has a maximum spacing relative to the longitudinal axis of the axially elongate dental machining portion, measured normal to the longitudinal axis of the axially elongate dental machining portion, and the fixing projection surface having a maximum spacing relative to the longitudinal axis of the axially elongate dental machining portion, measured normal relative to the longitudinal axis of the axially elongate dental machining portion, that is greater than the maximum spacing of the machinable surface relative to the longitudinal axis of the axially elongate dental machining portion, and
• wherein the fixing region includes:
• a front side which is oriented transversely relative to the longitudinal axis of the axially elongate dental machining portion,
• a conical region having a conical surface and directly adjoining the front side,
• a first cylindrical region having a cylindrical surface directly adjoining the conical surface, the fixing projection surface directly adjoining the first cylindrical region, and being oriented at an angle of between 45 and 135 degrees relative to the first cylindrical region, and
• a second cylindrical region of a smaller diameter than the first cylindrical region, the second cylindrical region directly adjoining the fixing projection surface and extending directly to the machining region, and
• wherein the conical region, between the front side and the first cylindrical region, has a constant angle relative to the longitudinal axis of the axially elongate dental machining portion from a first area of the conical region directly adjoining the front side to a second area of the conical region directly adjoining the first cylindrical region.