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EP0530160B1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Anchoring member

Assignee: Nobel Biocare AB
•
Filing: 1992-07-07
•
Granted: 1996-04-03
•
Expires: 2012-07-07
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Abstract

Abstract The present invention relates to a screw-shaped titanium anchoring member for permanent anchorage in bone tissue, specifically permanent anchorage of artificial teeth or tooth bridges in the jaw-bone. The tip of the anchoring member comprises at least one cavity (4). The edges of the cavities on the outer cylindrical surface are forming cutting edges (5) to provide self-tapping when the anchoring member is screwed into the bone tissue. The total volume of the cavities is adapted to contain the scraped-off bone tissue material, i.e. all the scraped-off bone tissue material can be housed in the screw in the volume formed by the cavities. Behind the cutting edges (5) the anchoring member has a clearance surface (9), i.e. behind each cutting edge the surface of the anchoring member is slightly bevelled towards the center of the anchoring member. By means of such clearance surface any squeezing effect which might occur in the cutting portion of the fixture when it is screwed into hard bone tissue can be avoided.

Inventors

  • 👤 Lars Jörnéus
  • 👤 Anders Boss

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 15:17
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0018; A61C8/0022

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 121 words
Screw-shaped titanium anchoring member for permanent anchorage in bone tissue specifically permanent anchorage of artificial teeth or tooth bridges in the jaw-bone, comprising at least one cavity (4) on the tip of the screw, the edges of said cavities on the outer cylindrical surface forming cutting edges (5) to provide self-tapping when the anchoring member is screwed into the bone tissue and the total volume of the cavities adapted to contain the scraped-off bone tissue material characterized in that the anchoring member behind its cutting edges (5) is provided with a clearance surface (9), i.e. the outer surface of the anchoring member, seen in a section through the cutting part of the anchoring member, is slightly bevelled behind each cutting edge.
Claim 2
Dependent Claim 17 words
Anchoring member according to claim 1 characterized in that the clearance surface (9) is a plane surface.
Claim 3
Dependent Claim 17 words
Anchoring member according to claim 1 characterized in that the clearance surface (9) is a curved surface.
Claim 4
Dependent Claim 33 words
Anchoring member according to claim 1 characterized by a conical tip having a cone angle of 15°-40°, said cavities (4) as well as the clearance surfaces (9) extending down into the conical part.
Claim 5
Dependent Claim 32 words
Anchoring member according to claim 4 characterized in that the thread diameter of the non-cutting portion of the screw is less than the thread diameter of the cutting portion of the screw.
Claim 6
Dependent Claim 29 words
Anchoring member according to claim 1 characterized by three cutting edges (5) and clearance surfaces (9) symmetrically distributed about the periphery of the cylindrical surface of the anchoring member.

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