Patent US5074790A successfully refreshed from Google Patents.
US5074790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw implant for a jawbone
Assignee: Individual
•
Filing: 1989-11-15
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Granted: 1991-12-24
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Expires: 2009-11-15
Abstract
Abstract A screw implant for a jawbone has a conical threaded implant body with an implant neck and a conical implant post to accept a replacement tooth or a substructure. The thread of the implant body is a compression thread with concave thread turns. The implant neck preferably defines a bending zone wherein the ratio of the diameter D B to the length L B of the bending zone is in the range of 1:1.5 to 1:3. The bending angle is up to 30 degrees and the number of bendings of the bending zone is 3 to 4, when the implant post is bent back and forth. The implant neck has broadening transition sections.
Inventors
- 👤 Ernst Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:02
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0048; A61C8/0075; A61C8/0012; A61C8/0018; A61C8/0022; A61C8/0078
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
89 words
A screw implant for a jawbone comprising: a threaded conical implant body adapted to be screwed into a jawbone; and an attachment defining an implant neck and a conical implant post to accept a replacement tooth or substructure; said implant body comprising a compression thread comprising concave thread turns; and said compression thread defining an outer boundary cone having an angle of opening ∝ 1 and a core having a core angle ∝ 2 , the ratio α 1 :α 2 being in the range of 1:0.6 to 1:1.
Claim 2
Dependent Claim
89 words
A screw implant for a jawbone comprising: a threaded conical implant body adapted to be screwed into a jawbone; and an attachment defining an implant neck and a conical implant post to accept a replacement tooth or substructure; said implant body comprising a compression thread comprising concave thread turns; and said compression thread defining an outer boundary cone having an angle of opening ∝ 1 and a core having a core angle ∝ 2 , the ratio α 1 :α 2 being in the range of 1:0.6 to 1:1.
Claim 3
Dependent Claim
25 words
The screw implant of claim 1 wherein said greatest depth of said individual thread turns is about one-third of the pitch h of said thread.
Claim 4
Dependent Claim
41 words
The screw implant of claim 1 wherein said thread turns have the shape of a circular arc and a radius of curvature r G of each thread turn greater than or equal to one-third of the pitch h of said thread.
Claim 5
Dependent Claim
17 words
The screw implant of claim 3 wherein said radius of curvature r G is equal to h/2.
Claim 6
Dependent Claim
46 words
The screw implant of claim 1 wherein an implant shoulder is formed at the upper end of said implant body, said shoulder extending into said implant neck and defining a bending zone, said implant post being formed on a conical broadening region of said implant neck.
Claim 7
Dependent Claim
35 words
The screw implant of claim 5 wherein said bending zone has a diameter D B and a length L B , the ratio D B :L B being in the range of 1:1.5 to 1:3.
Claim 8
Dependent Claim
34 words
The screw implant of claim 5 wherein said implant neck has at least one broadening transition region bordering the bending zone and having a radius of curvature r A of 2 to 3 mm.
Claim 9
Dependent Claim
34 words
The screw implant of claim 5 wherein said bending zone has a bending radius r B of less than or equal to 3 mm at a bending zone angle ∝ B of 30 degrees.
Claim 10
Dependent Claim
31 words
The screw implant of claim 5 wherein the number of bendings of said bending zone is 3 to 4 when the implant post is bent back and forth by 30 degrees.
Claim 11
Dependent Claim
28 words
The screw implant of claim 5 wherein the tensile strength of said implant neck is at least 2400 N at a bending angle ∝ B of 30 degrees.
Claim 12
Dependent Claim
36 words
The screw implant of claim 1 wherein two flat areas opposite to one another are defined in an upper end region of said implant post in order to accept a rectangular key of a straightening tool.
Claim 13
Dependent Claim
19 words
The screw implant of claim 1 wherein a free end of said implant post defines as a spherical head.
Claim 14
Dependent Claim
21 words
The screw implant of claim 1 comprising a titanium alloy having a surface passivated with a protective layer of titanium oxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |