Patent US2077954A successfully refreshed from Google Patents.
US4758160A
Expired / Lapsed
US
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Dental implant
Assignee: ISIS International Inc
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Filing: 1986-11-20
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Granted: 1988-07-19
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Expires: 2006-11-20
Abstract
Abstract A dental implant comprising an endosteal implant, having a bifurcated core therein, adapted for receiving a prosthetic head. The abutting surfaces of the endosteal implant and the prosthetic head preferably have equal outer diameters. The prosthetic head has a bifurcated shank thereon. The bifurcated core and bifurcated shank cooperate to secure the prosthetic head to the endosteal implant only at an inner segment of the bifurcated core, so as to preserve an annular space between the outer shank segment and the outer portion of the bifurcated core in the area of the alveolar bone. By means of this specialized attachment of the prosthetic head to the endosteal implant, stresses applied to the prosthetic head are translated directly to an inner segment of the endosteal implant, and thus are not applied to the alveolar ridge. Cratering of the alveolar bone is minimized as a result.
Inventors
- 👤 Yahia H. Ismail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:41
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0048; A61C8/005; A61C8/0018; A61C8/0081; A61C8/0054
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
151 words
A dental implant, comprising: an endosteal implant having an alveolar surface and a hollow core therein, a prosthetic head having a shaft thereon, and a prosthesis, wherein said shaft comprises an inner segment and an outer segment, wherein said shaft is removably affixed to said endosteal implant by means of said inner segment at a point spaced inward from said alveolar surface, said outer segment being positioned within said hollow core so as to form an annular area between said outer segment and the surface defining said hollow core, said annular area containing a material consisting of a resilient filler having no capacity for translating applied forces, and further wherein said prosthetic head is fixedly attached to said prosthesis, whereby forces applied to said prosthesis translate directly to said endosteal implant at said point spaced inward from said alveolar surface, to minimize rotational forces and stress application to the alveolar bone.
Claim 2
Dependent Claim
151 words
A dental implant, comprising: an endosteal implant having an alveolar surface and a hollow core therein, a prosthetic head having a shaft thereon, and a prosthesis, wherein said shaft comprises an inner segment and an outer segment, wherein said shaft is removably affixed to said endosteal implant by means of said inner segment at a point spaced inward from said alveolar surface, said outer segment being positioned within said hollow core so as to form an annular area between said outer segment and the surface defining said hollow core, said annular area containing a material consisting of a resilient filler having no capacity for translating applied forces, and further wherein said prosthetic head is fixedly attached to said prosthesis, whereby forces applied to said prosthesis translate directly to said endosteal implant at said point spaced inward from said alveolar surface, to minimize rotational forces and stress application to the alveolar bone.
Claim 3
Dependent Claim
18 words
The dental implant according to claim 1, wherein said hollow core and said shaft are equal in length.
Claim 4
Dependent Claim
21 words
The dental implant according to claim 1, wherein said inner segment of said shaft comprises one-half the length of said shaft.
Claim 5
Dependent Claim
31 words
The dental implant according to claim 3, wherein said inner segment of said shaft is adapted to affix to the inner one-half segment of said hollow core of said endosteal implant.
Claim 6
Dependent Claim
22 words
The dental implant according to claim 4 wherein said inner segments of said shaft and of said hollow core are cooperatively threaded.
Claim 7
Dependent Claim
35 words
The dental implant according to claim 5 wherein the midpoint along the length of the cooperatively threaded areas of said shaft and said hollow core is the midpoint along the length of the endosteal implant.
Claim 8
Dependent Claim
41 words
The dental implant according to claim 5 wherein the midpoint along the length of the cooperatively threaded areas of said shaft and said hollow core is nearer said prosthetic head than is the midpoint of the length of said endosteal implant.
Claim 9
Dependent Claim
42 words
The dental implant according to claim 5 wherein the midpoint along the length of the cooperatively threaded areas of said shaft and said hollow core is farther from said prosthetic head than is the midpoint of the length of said endosteal implant.
Claim 10
Dependent Claim
32 words
The dental implant according to claim 5 wherein said outer segments of said shaft and of said hollow core of said endosteal implant define an annular area of at least 0.05 millimeter.
Claim 11
Dependent Claim
29 words
The dental implant according to claim 5 wherein said outer segments of said shaft and said hollow core of said endosteal implant define an annular area of 0.25 millimeter.
Claim 12
Dependent Claim
16 words
The dental implant according to claim 1 wherein said prosthetic head has a generally frustoconical shape.
Claim 13
Dependent Claim
17 words
The dental implant according to claim 11 wherein said prosthetic head has a serrated outer surface thereon.
Claim 14
Dependent Claim
28 words
The dental implant according to claim 11 wherein said endosteal implant tapers from a maximum outer diameter at its outermost end to a minimum diameter at its tip.
Claim 15
Dependent Claim
26 words
The dental implant according to claim 13, wherein the maximum outer diameter of said endosteal implant equals the maximum outer diameter of the frustoconical prosthetic head.
Claim 16
Dependent Claim
40 words
The dental implant according to claim 14 wherein said prosthetic head and said endosteal implant are fabricated from one or more materials selected from the group consisting of biologically inert alloys of stainless steel and biologically inert alloys of titanium.
Claim 17
Dependent Claim
17 words
The dental implant according to claim 1 wherein said endosteal implant has a serrated outer surface thereon.
Claim 18
Dependent Claim
29 words
The dental implant according to claim 1 wherein the length of said prosthetic head, excluding the length of said shaft, is less than the length of said endosteal implant.
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |