Dental Implant

Abstract

In a dental implant ( 1 ) comprising a post part ( 2 ) which can be placed in a jaw bone and comprising a structural part ( 4 ) associated with said post part, to which structural part a denture piece can be attached, the structural part comprising an integrally moulded contact pin ( 8 ) which can be placed in an associated shaped recess ( 10 ) in the post part ( 2 ) with a positive fit, it is to be possible on the one hand to suitably index the implant in a simple and reliable manner, on the other hand a particularly high level of mechanical stability against rotation being ensured, even with an overall height which is kept low. For this purpose, in accordance with the invention the cross-sections of the contact pin ( 8 ) integrally moulded on the structural part and of the shaped recess ( 10 ), associated with said contact pin, in the post part ( 2 ) each have a number of primary directions in which the radius in each case adopts a relative maximum value, the outer contour of the cross-section being selected in such a way that it is intersected at at most two points by any straight lines, and each point has only one tangent.

1 - 8 . (canceled) 
     
     
         9 . A dental component comprising
 a contact pin which can be placed in a recess in a second dental component, wherein the cross-section of the contact pin has a number of at least three primary directions in which the radius of the cross-section adopts a relative maximum value RO, and a number of at least three secondary directions in which the radius of the cross-section adopts a relative minimum value r, wherein the outer contour of the cross-section of the contact pin is selected in such a way that it has precisely one tangent at each point, and wherein the contact pin is tapered.   
     
     
         10 . The dental component according to  claim 9 , wherein the dental component is a structural part of a dental implant and the second dental component is a post part of the dental implant. 
     
     
         11 . The dental component according to  claim 9 , wherein the dental component is a post part of a dental implant and the second dental component is a structural part of the dental implant. 
     
     
         12 . The dental component according to  claim 9 , in which the outer contour of the cross-section is selected in such a way that it is intersected at most two points by any straight lines. 
     
     
         13 . The dental component according to  claim 9 , in which the outer contour of the cross-section is selected in such a way that it corresponds to a segment of an oval in the regions between each two primary directions. 
     
     
         14 . The dental component according to  claim 9 , in which the contact pin has a tri-oval cross-section. 
     
     
         15 . The dental component according to  claim 9 , in which the contour of the cross section is selected in such a way that for n being the number of primary directions, the ratio of minimum value to maximum value of the radius is in the interval is as follows: 
       
         
           
                 
                 
               
                     
                 
                   Number n of primary directions 
                   Ratio minimum radius/maximum radius 
                 
                     
                 
                   3 
                   70-95% 
                 
                   4 
                   80-97% 
                 
                   5 
                   90-98% 
                 
                   6 
                   95-99% 
                 
                   7 
                   96-99% 
                 
                   8 
                   97-99% 
                 
                   9 
                   98-99% 
                 
                     
                 
             
                
                
                
               
               
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         16 . The dental component according to  claim 9 , in which the taper angle of the contact pin is between 1° and 15°. 
     
     
         17 . The dental component according to  claim 9 , in which the taper angle of the contact pin is between 5° and 10°. 
     
     
         18 . The dental component according to  claim 9 , in which the taper angle of the contact pin is approximately 6°. 
     
     
         19 . The dental component according to  claim 9 , in which the contact pin comprises at least one segment along its length that includes both the cross-section having the primary and secondary directions and a tapered shape. 
     
     
         20 . The dental component according to  claim 10 , whereupon a dental restoration can be attached thereto. 
     
     
         21 . The dental component according to  claim 20 , wherein when placed in a post part of a dental implant, the dental component has a lift height ΔH, as a function of a taper angle and the minimum radius r in said secondary direction, as follows: 
       
         
           
             
               
                 
                   Δ 
                    
                   
                       
                   
                    
                   H 
                 
                 = 
                 
                   
                     
                       R 
                        
                       
                           
                       
                        
                       0 
                     
                     - 
                     r 
                   
                   
                     tan 
                      
                     
                       ( 
                       β 
                       ) 
                     
                   
                 
               
               , 
             
           
         
         wherein the lift height ΔH, as a function of a rotational offset from a rotation between the dental component and the post part from a starting position in which said primary direction of the contact pin is rotationally aligned with said primary direction of said shaped recess to an end position in which said primary direction of said contact pin is rotationally aligned with said secondary direction of said recess, is at least 900 μm/n, where n is the number of primary directions of the dental component in the post part. 
       
     
     
         22 . The dental component according to  claim 20 , wherein the lift height prevents outer threads of a connecting screw inserted in the dental component from engaging inner threads of the post part unless the rotational offset of the contact pin and shaped recess is such that a force applied by the connecting screw on the structural part begins to self-center the dental component in the post part. 
     
     
         23 . The dental component according to  claim 20 , wherein the outer threads of the connecting screw do not engage the inner threads of the post part where the rotational offset between the dental component and the post part is 360°/(2×n) where n is the number of primary directions of the structural part in the post part. 
     
     
         24 . The dental component according to  claim 22 , wherein upon self-centering and upon tightening of the connecting screw, the outer threads of the connecting screw and the inner threads of the post part become engaged. 
     
     
         25 . A dental implant for insertion into the jaw bone of a patient, said dental implant comprising a shaped recess which a contact pin of a structural part of a dental implant can be placed with positive fit, wherein the cross-section of the shaped recess has a number of at least three primary directions in which the radius of the cross-section adopts a relative maximum value RO, and a number of at least three secondary directions in which the radius of the cross-section adopts a relative minimum value r, wherein the contour of the cross-section of the shaped recess is selected in such a way that it has precisely one tangent at each point, and wherein the shaped recess is tapered. 
     
     
         26 . The dental implant according to  claim 25 , wherein said recess is designed such that said contact pin when placed in said recess has a lift height ΔH, as a function of a taper angle β and the minimum radius r in said secondary direction, as follows: 
       
         
           
             
               
                 
                   Δ 
                    
                   
                       
                   
                    
                   H 
                 
                 = 
                 
                   
                     
                       R 
                        
                       
                           
                       
                        
                       0 
                     
                     - 
                     r 
                   
                   
                     tan 
                      
                     
                       ( 
                       β 
                       ) 
                     
                   
                 
               
               , 
             
           
         
         wherein the lift height ΔH, as a function of a rotational offset from a rotation between the structural part and the dental implant from a starting position in which said primary direction of the contact pin is rotationally aligned with said primary direction of said shaped recess to an end position in which said primary direction of said contact pin is rotationally aligned with said secondary direction of said recess, is at least 900 μm/n, where n is the number of primary directions of the structural part in the dental implant. 
       
     
     
         27 . The dental implant according to  claim 26 , wherein the lift height prevents outer threads of a connecting screw inserted in the structural part from engaging inner threads of the dental implant unless the rotational offset of the contact pin and shaped recess is such that a force applied by the connecting screw on the structural part begins to self-center the structural part in the dental implant.