Dental implant, insertion tool for dental implant and combination of dental implant and insertion tool

Abstract

A dental implant (1), in particular for insertion into bone tissue of a patient, comprising: a core body (2) having an apical end (4), a coronal end (6), and an outer surface (8) extending along a longitudinal direction between said apical end (4) and said coronal end (6); and at least one thread (12) located on at least a threaded portion of said outer surface (8), should have superior properties regarding primary and secondary stability. According to the invention this is achieved in that the core body (2) comprises a core shaped zone (22), preferably next to said coronal end (6), in which core shaped zone (22) the cross-section of said core body (2) has a number of main directions in which the radius measuring the distance between the center (50) of the cross section and its outer contour takes a relative maximum value and thus a higher value than in neighboring orientations, a core circular zone (20), preferably next to said apical end (4), in which core circular zone (20) the cross-section of said core body (2) is basically circularly shaped, and, as seen in said longitudinal direction, a transition zone (26) positioned between said core shaped zone (22) and said core circular zone (20), in which transition zone (26) the geometry of the cross-section of said core body (2), as a function of a parameter characteristic for a coordinate in said longitudinal direction, changes continuously from a basically circular shape next to said core circular zone (20) to a shape in which the cross-section of said core body (2) corresponds to the shape of the cross section in said core shaped zone (32). The invention further relates to an insertion tool (200) for inserting a dental implant (1, 201, 401) into bone tissue of a patient. Moreover, the invention relates to a combination of such a dental implant (1, 201, 401) and such an insertion tool (200).

1 .- 54 . (canceled) 
     
     
         55 . A dental implant for insertion into bone tissue of a patient, comprising:
 a core body having an apical end and a coronal end, and   at least one thread extending outwardly from said core body,   wherein the core body comprises a channel which is open to the coronal end and extends along a longitudinal direction of the implant from the coronal end towards the apical end, and   wherein the core body has a drive zone, in which drive zone a cross-section of the channel perpendicular to the longitudinal direction of the implant has a plurality of radially convex portions arranged along a circumference of the cross-section, wherein each radially outermost point of the plurality of radially convex portions lies on a respective circle around a center of the cross-section, at least two of said circles having different radii from each other,   wherein the core body further has an indexing portion, in which the indexing portion a cross-section of the channel perpendicular to the longitudinal direction of the implant has a number of main directions in which a radius measuring a distance between the center of the cross-section and its outer contour takes a relative maximum value and thus a higher value than in neighboring orientations, and   wherein the drive zone is arranged apically of the indexing portion.   
     
     
         56 . The dental implant according to  claim 55 , wherein the indexing portion has a tapered configuration such that, in the indexing portion, lateral dimensions of the cross-section of the channel perpendicular to the longitudinal direction of the implant decrease along the longitudinal direction from the coronal end towards the apical end. 
     
     
         57 . The dental implant according to  claim 56 , wherein the number of main directions is three or more. 
     
     
         58 . The dental implant according to  claim 55 , wherein radially innermost points of the radially convex portions lie on a single circle around the center of the cross-section. 
     
     
         59 . The dental implant according to  claim 55 , wherein
 the plurality of radially convex portions comprise first radially convex portions and second radially convex portions,   the radially outermost points of the first radially convex portions all lie on a single first circle around the center of the cross-section,   the radially outermost points of the second radially convex portions all lie on a single second circle around the center of the cross-section,   the second circle has a smaller radius than the first circle, and   the first radially convex portions and the second radially convex portions are alternatingly arranged along the circumference of the cross-section.   
     
     
         60 . The dental implant according to  claim 55 , in which a number of cutting flutes are provided at least in a coronal section of the implant. 
     
     
         61 . The dental implant according to  claim 60 , in which said cutting flutes are positioned symmetrically with respect to a central longitudinal axis of said core body. 
     
     
         62 . The dental implant according to  claim 60 , wherein said core body comprises a first core shaped zone, in which first core shaped zone the cross-section of said core body has a number of main directions in which the radius measuring the distance between the center of the cross section and its outer contour takes a relative maximum value and thus a higher value than in neighboring orientations, and wherein each cutting flute, as seen in orientational direction around a central longitudinal axis of said core body, is positioned at a given rotational offset to a neighboring main direction. 
     
     
         63 . The dental implant according to  claim 62 , wherein the number of cutting flutes, equals to the number of main directions. 
     
     
         64 . The dental implant according to  claim 60 , wherein, the cutting flutes are positioned in a threaded region of the implant, each cutting flute being positioned with a displacement relative to its neighboring cutting flute, such that in their positions the cutting flutes follow a pitch of the thread around the longitudinal axis of the implant. 
     
     
         65 . The dental implant according to  claim 55 , wherein the cross-section of the channel perpendicular to the longitudinal direction of the implant has a plurality of radially concave portions alternatively arranged with the plurality of radially convex portions along the circumference of the cross-section. 
     
     
         66 . The dental implant according to  claim 65 , wherein the radially convex portions and the radially concave portions are arranged directly adjacent to each other. 
     
     
         67 . The dental implant according to  claim 65 , wherein the radially convex portions and the radially concave portions each have a curved shape. 
     
     
         68 . The dental implant according to  claim 67 , wherein the curved shape is an at least partially circular shape, an at least partially elliptical shape, or an at least partially oval shape. 
     
     
         69 . The dental implant according to  claim 65 , wherein the number of radially convex portions and the number of radially concave portions are the same. 
     
     
         70 . The dental implant according to  claim 70 , wherein the number of radially convex portions and the number of radially concave portions are both six. 
     
     
         71 . The dental implant according to  claim 59 , wherein the number of first radially convex portions is the same as the number of second radially convex portions.