Patent US4185383A successfully refreshed from Google Patents.
US4185383A
Expired / Lapsed
US
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Dental implant having a biocompatible surface
Assignee: Friatec AG
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Filing: 1977-04-29
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Granted: 1980-01-29
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Expires: 1997-04-29
Abstract
Abstract A dental implant of biocompatable material includes a body provided with a head for supporting bridgework or an artificial tooth and having a shaft which is provided with a series of exterior peripheral surfaces of diminishing cross-section to define a series of stepped thrust resisting surfaces perpendicular to the axis of the shaft with the proximal end of the shaft being smooth.
Inventors
- 👤 Gunther Heimke
- 👤 Willi Schulte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:01
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0018; A61C8/0037; A61C8/0045; A61C8/0089
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
166 words
Dental implant comprising an elongated body provided with a surface composed of biocompatible material, the upper end of said body including a head provided with means of anchoring a superstructure to be supported by said implant, a shaft extending downwardly from the head, the exterior periphery of said shaft having stepped surfaces generally perpendicular to the axis of the shaft and of progressively decreasing mean diameter and successive peripheral surfaces of the shaft also having progressively decreasing cross-sections as the lower end of the shaft is approached, the cross-section at the upper end of each peripheral surface being at least equal to the cross-section at the lower end of the same peripheral surface, and the cross-section of each peripheral surface at its lower end being larger than the cross-section of the next lower peripheral surface, the difference between the last two mentioned cross-sections defining the adjacent stepped surface, whereby all of the stepped surfaces may lie in abutting contact with load-bearing bone tissue immediately upon implanatation.
Claim 2
Dependent Claim
166 words
Dental implant comprising an elongated body provided with a surface composed of biocompatible material, the upper end of said body including a head provided with means of anchoring a superstructure to be supported by said implant, a shaft extending downwardly from the head, the exterior periphery of said shaft having stepped surfaces generally perpendicular to the axis of the shaft and of progressively decreasing mean diameter and successive peripheral surfaces of the shaft also having progressively decreasing cross-sections as the lower end of the shaft is approached, the cross-section at the upper end of each peripheral surface being at least equal to the cross-section at the lower end of the same peripheral surface, and the cross-section of each peripheral surface at its lower end being larger than the cross-section of the next lower peripheral surface, the difference between the last two mentioned cross-sections defining the adjacent stepped surface, whereby all of the stepped surfaces may lie in abutting contact with load-bearing bone tissue immediately upon implanatation.
Claim 3
Dependent Claim
18 words
Dental implant as defined in claim 1 wherein said means for anchoring a superstructure comprises a threaded bushing.
Claim 4
Dependent Claim
25 words
Dental implant as defined in claim 1 wherein said means for anchoring a superstructure comprises an extension adapted to be shaped to support a superstructure.
Claim 5
Dependent Claim
37 words
Dental implant as defined in claim 1 wherein at least one of said stepped surfaces is provided with a plurality of recesses, and the lower end of said shaft is provided with a smooth convex terminal surface.
Claim 6
Dependent Claim
46 words
Dental implant as defined in claim 4 wherein the intersections of said recesses with the exterior stepped surface are defined by circles, each having a diameter within the range of 0.15 and 1.0 mm, said recessed having depths equivalent to approximately one-half of the respective diameter.
Claim 7
Dependent Claim
57 words
Dental implant as defined in claim 4 wherein the intersections of said recesses with the exterior stepped surface are defined by squares, the length of the sides of the squares being within the range of 0.15 to 1.0 mm, said recesses having depths equivalent to approximately one-half of the length of a respective side of the square.
Claim 8
Dependent Claim
49 words
Dental implant as defined in claim 4 wherein the intersections of said recesses with the exterior stepped surfaces are oblong, the width of each recess being within the range of 0.15 to 1.0 mm, said recesses having depths equivalent to approximately one-half of the width of the respective oblong.
Claim 9
Dependent Claim
32 words
Dental implant as defined in claim 1 wherein the head of said shaft is provided with an encircling recessed surface, said recessed surface and adjacent surface of the head being highly polished.
Claim 10
Dependent Claim
23 words
Dental implant as defined in claim 1 wherein the cross-section of at least one of the stepped surfaces of the shaft is non-circular.
Claim 11
Dependent Claim
21 words
Dental implant as defined in claim 9 wherein at least a portion of said cross-section is defined by a straight line.
Claim 12
Dependent Claim
12 words
Dental implant as defined in claim 9 wherein said cross-section is elliptical.
Claim 13
Dependent Claim
26 words
Dental implant as defined in claim 11 wherein the ratio of the two axes of said elliptical cross-section is on the order of 1 to 3.
Claim 14
Dependent Claim
20 words
Dental implant as defined in claim 1 wherein said elongated body comprises a metallic core coated with a biocompatible composition.
Claim 15
Dependent Claim
15 words
Dental implant as defined in claim 13 wherein said metallic core comprises high strength steel.
Claim 16
Dependent Claim
25 words
Dental implant as defined in claim 13 wherein said elongated body includes an intermediate layer of material between said metallic core and said biocompatible composition.
Claim 17
Dependent Claim
21 words
Dental implant as defined in claim 1 wherein said biocompatible composition comprises a dense non-porous Al 2 O 3 ceramic composition.
Claim 18
Dependent Claim
23 words
Dental implant as defined in claim 16 wherein said ceramic composition includes at least 95% by weight, of Al 2 O 3 .
Claim 19
Dependent Claim
23 words
Dental implant as defined in claim 16 wherein said ceramic composition includes at least 99% by weight, of Al 2 O 3 .
Claim 20
Dependent Claim
24 words
Dental implant as defined in claim 1 wherein only those portions of said body to be embedded in a jawbone comprise biologically benign composition.
Claim 21
Dependent Claim
21 words
Dental implant as defined in claim 19 wherein said portions to be embedded comprise the shaft provided with said stepped surfaces.
Claim 22
Dependent Claim
16 words
Dental implant as defined in claim 19 wherein said biologically benign composition comprises a glass ceramic.
Claim 23
Dependent Claim
32 words
Dental implant as defined in claim 19 wherein said biologically benign composition includes a material selected from the group consisting of lithium, boron, carbon, fluorine, sodium, magnesium, silicon, phosphorous, potassium, and calcium.
Claim 24
Dependent Claim
35 words
Dental implant as defined in claim 1 for implantation in a plurality of adjacent alveoli, comprising a single head for supporting a superstructure joined with a plurality of shafts to be received in said alveoli.
References Cited (Backward Citations)
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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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |