Dental implant made of a metal or a metal alloy

1 . Dental implant ( 1 ) for anchoring of a dental prosthesis, wherein the dental implant ( 1 ) comprises a core ( 10 ) and an external thread ( 3 ) surrounding the core ( 10 ), wherein the dental implant ( 1 ) has an apical end ( 11 ) and a cervical end ( 12 ) to be screwed by the external thread ( 3 ) with the apical end ( 11 ) first into a recess formed in a jaw bone and to anchor the dental prosthesis at the cervical end ( 12 ), wherein the dental implant ( 1 ) material comprises a metal or a metal alloy, wherein the dental implant ( 1 ) comprises in the order from the apical end ( 11 ) to the cervical end ( 12 )

a tip area ( 2 ) in which the external thread ( 3 ) is sharp-edged,

a middle area ( 4 ) adjoining the tip area ( 2 ), in which the external thread ( 3 ) is trapezoid-like and

a coronal area ( 6 ) adjoining the middle area ( 4 ), in which the external thread ( 3 ) is sharp-edged and sharper-edged than the external thread ( 3 ) in the middle area ( 4 ),

wherein a longitudinal axis (L) extends through the tip area ( 2 ), the middle area ( 4 ) and the coronal area ( 6 ), wherein the core ( 10 ) has a bulge (A) in the middle area ( 4 ) in any cross-section passing through the entire length of the longitudinal axis (L), while the tip area ( 2 ) and the coronal area ( 6 ) are not bulged and the external thread ( 3 ) has a nominal diameter which is constant in the entire middle area or increases in the entire middle area in a direction from the apical end ( 11 ) to the cervical end ( 12 ), whereby the external thread ( 3 ) is not bulged in the middle area ( 4 ) in any cross-section passing through the entire length of the longitudinal axis (L), wherein a thread depth of the external thread ( 3 ) is smaller at every position in an area of the bulge (A) than at every position in the tip area ( 2 ) and at every position in the coronal area ( 6 ), wherein the greater the bulge (A) of the core ( 10 ) the smaller the thread depth, wherein the thread depth in the tip area ( 2 ) and in the coronal area ( 6 ) is greater than in the middle area ( 4 ).

2 . Dental implant ( 1 ) according to claim 1 , wherein the metal is titanium and the metal alloy comprises titanium.

3 . Dental implant ( 1 ) according to claim 1 , wherein an end area ( 8 ) adjoins the coronal area ( 6 ).

4 . Dental implant ( 1 ) according to claim 3 , wherein the end area ( 8 ) has an external or internal connection and an internal thread ( 9 ).

5 . Dental implant ( 1 ) according to claim 1 , wherein the external thread ( 3 ) and the core ( 10 ) are formed in one piece.

6 . Dental implant ( 1 ) according to claim 1 , wherein the nominal diameter of the external thread ( 3 ) increases in a direction from the apical end ( 11 ) to the cervical end ( 12 ) in an entire area comprising the tip area ( 2 ), the middle area ( 4 ) and the coronal area ( 6 ).

7 . Dental implant ( 1 ) according to claim 1 , wherein the nominal diameter of the external thread ( 3 ) is equal in a direction from the apical end ( 11 ) to the cervical end ( 12 ) in an entire area comprising the tip area ( 2 ), the middle area ( 4 ) and the coronal area ( 6 ).

8 . Dental implant ( 1 ) according to claim 1 , wherein the entire external thread ( 3 ) in the tip area ( 2 ) is sharper-edged than the external thread ( 3 ) in the middle area ( 4 ).

9 . Method of manufacturing of the dental implant ( 1 ) according to claim 1 by turning a turned part from a material which comprises a metal or a metal alloy, wherein the external thread ( 3 ) is cut into the turned part by a cutting tool, wherein the bulge (A) in the middle area ( 4 ) is created by changing of a distance of a cutting area of the cutting tool from a rotation axis coinciding with the longitudinal axis (L).