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1. WO1997043976 - ELEMENT D'ANCRAGE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

PATENT CLAIMS

1. Anchoring element (1) for screwing with a tightening torque into a hole (30, 31) made in the dentine (29) and comprising a threaded element with a conical portion (3) and one or more recesses (5, 6, 7) in order to form a cutting edge (8, 9, 10) in the respective recesses, thread-turn parts (17-21) starting from each cutting edge being lowered vertically (f) at the rear

(seen in the direction of rotation 11) where they merge with a relief surface (14, 15, 16) which is arranged at a distance from each cutting edge and is intended to reduce said tightening torque for the anchoring element, characterized in that the relief surface (14, 15, 16) is arranged on the conical portion (3) where it extends essentially parallel to (coincides with) a plane (15) tangential to the conical portion (3).
2. Element according to Patent Claim 1, characterized in that the thread in the conical portion (3) is arranged so that the inner diameter of the thread (i.e. the bottom diameter 19'' of the thread turn) is also conically arranged, i.e. the inner diameter of the thread decreases gradually as the tip (the end 13 of the element) is approached.
3. Element according to Patent Claim 2, characterized in that the number of recesses, and therefore the number of relief surfaces, is three and in that the three relief surfaces (14, 15, 16) are parallel to or coincide with each of said tangential planes (15) .

4. Element according to Patent Claim 1, 2 or 3 , characterized in that each relief surface (14, 15, 16) is essentially straight .
5. Element according to any one of the preceding patent claims, characterized in that it is designed for application in both hard and soft dentine material (29) . 6. Element according to any one of the preceding patent claims, characterized in that, on the conical portion (3) , the thread-turn height (f ) at each cutting edge (8, 9, 10) is designed so as to decrease gradually in the direction of the end (13) of the element.
7. Element according to any one of the preceding patent claims, characterized in that it is designed with a comparatively short length (H) , e.g. with a length which is selected within the range 10-20 mm.
8. Element according to any one of the preceding patent claims, characterized in that half the cone angle

(α) for each relief surface (14, 15, 16) is selected within the range 2-10°, preferably within the range 3-7°.

9. Element according to any one of the preceding patent claims, characterized in that half the cone angle

(/3) for the upper parts (19') of the thread-turn parts close to each cutting edge on the conical portion (3) is selected within the range 5-20°, preferably within the range 10-15°.
10. Element according to any one of the preceding patent claims, characterized in that each thread turn around the periphery of the conical portion consists of remaining thread-turn sections (17-21) arranged at essentially the same distance from one another, and in that a sector angle (γ' ' ) for each remaining thread-turn section is selected within the range 8-20°, preferably within the range 12-15°.
11. Element according to any one of the preceding patent claims, characterized in that each relief surface

(14, 15, 16) has a sector angle (γ' ) within the range 5- 15°, and is preferably approximately 10°.
12. Element according to any one of the preceding patent claims, characterized in that each relief surface

(14, 15, 16) is lowered in the material of the conical portion and extends in part between (14a) the backwardly decreasing thread-turns.