Fixture

1. A fixture for insertion into a bore hole arranged in bone tissue, comprising a threaded leading portion and a threaded trailing portion located coronally of the threaded leading portion,

wherein the threading of the threaded leading portion has at least one first thread spiral,

wherein the threading of the threaded trailing portion has at least one more thread spirals than a number of thread spirals of the threaded leading portion,

wherein the threading of the threaded trailing portion and the threading of the threaded leading portion have the same or substantially the same lead,

wherein the profile of at least one of the thread spirals in the threaded trailing portion is, at least along a portion of its extension, substantially the same as the profile of the outermost part of said at least one first thread spiral in the threaded leading portion, and

wherein the at least one thread spiral in the threaded trailing portion having substantially the same profile as the outermost part of said at least one first thread spiral in the threaded leading portion is arranged to follow the spiral path of said at least one first thread spiral

wherein said substantially the same profile is such that the thread spiral in the threaded trailing portion that follows the path of said at least one first thread spiral in the threaded leading portion (i) has the same radius of curvature at a top of the peaks as said at least one first thread spiral, which peaks individually have a circular or curved profile when viewed in a longitudinal cross-section, and (ii) also has the same apical and coronal flank angles relative to a plane perpendicular to a central fixture axis, respectively, as said at least one first thread spiral

wherein a major diameter of the fixture is similar in both the threaded leading portion and the threaded trailing portion.

2. A fixture according to claim 1 , wherein the at least one more thread spirals in the threaded trailing portion have substantially the same profile as the outermost part of said first thread spiral in the threaded leading portion.

3. A fixture according to claim 1 , wherein the profile of one of the thread spirals of the at least one more thread spirals in the threaded trailing portion, that does not follow the path of said first thread spiral in the threaded leading portion, alters along the thread.

4. A fixture according to claim 1 , wherein the smallest spacing between adjacent peaks of the threading in the threaded trailing portion is smaller than the smallest spacing between adjacent peaks of the threading in the threaded leading portion.

5. A fixture according to claim 1 , wherein the number of the at least one more thread spirals in the threaded trailing portion is an integer multiple of the number of thread spirals in the threaded leading portion.

6. A fixture according to claim 1 , wherein the threading in the threaded leading portion has at least a first and a second thread spiral, and wherein one of the at least one more thread spirals in the threaded trailing portion follows the path of said first thread spiral in the threaded leading portion.

7. A fixture according to claim 1 , wherein the fixture is self-tapping.

8. A fixture according to claim 1 , wherein the fixture is provided with separate cutting means adapted for cutting a female thread in the bone that corresponds to the profile of at least one of the thread spirals of the at least one more thread spirals at the threaded trailing portion.

9. A fixture according to claim 1 , wherein the depth of the threads in the threaded leading portion is larger than the depth of the threads in the threaded trailing portion.