Patent US4531916A successfully refreshed from Google Patents.
US4531916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental implant with expanded PTFE gingival interface
Assignee: W.L. Gore and Associates Inc
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Filing: 1983-07-08
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Granted: 1985-07-30
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Expires: 2003-07-08
Abstract
Abstract A dental implant device. A dental implant device having: (a) a root structure made of a biocompatible, mechanically suitable prosthetic material; (b) a cervical segment projecting above the root structure, made of a biocompatible, nonporous material and having smooth surfaces and together with the root structure forming a member; and (c) a gingival interface made of expanded polytetrafluoroethylene having a porous structure for the ingrowth of connective tissue, located adjacent to the juncture of the root structure and the cervical segment attached to the member and forming a border around the apical end of the cervical segment. The expanded polytetrafluoroethylene provides for an interlocking between the gingival tissue and the pergingival portion of the dental implant preventing bacterial penetration and infection where the implant extends into the oral cavity.
Inventors
- 👤 Todd V. Scantlebury
- 👤 Jeanne B. Ambruster
- 👤 Carl W. Bolton
- 👤 Stephen E. Campbell
- 👤 La Thaggar Green, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:51
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0012; A61C8/0003; A61C8/0004; A61C8/0006; A61C8/0016; A61C8/0018; A61C8/0037; A61C8/0039; A61C8/0019
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
111 words
A dental implant device comprising: a. a root structure made of a biocompatible, mechanically suitable prosthetic material; b. a cervical segment connected to and projecting above said root structure, said cervical segment made of a biocompatible, nonporous material and extending above the gingival epithelial tissue and having smooth surfaces, said root structure and said cervical segment forming a member; and c. a gingival interface comprising a porous polytetrafluoroethylene member having a pair of spaced surfaces that define a wall thickness for the polytetrafluoroethylene member with both spaced surfaces extending outwardly from the periphery of the root structure and the cervical segment to permit tissue ingrowth into each of said spaced surfaces.
Claim 2
Dependent Claim
111 words
A dental implant device comprising: a. a root structure made of a biocompatible, mechanically suitable prosthetic material; b. a cervical segment connected to and projecting above said root structure, said cervical segment made of a biocompatible, nonporous material and extending above the gingival epithelial tissue and having smooth surfaces, said root structure and said cervical segment forming a member; and c. a gingival interface comprising a porous polytetrafluoroethylene member having a pair of spaced surfaces that define a wall thickness for the polytetrafluoroethylene member with both spaced surfaces extending outwardly from the periphery of the root structure and the cervical segment to permit tissue ingrowth into each of said spaced surfaces.
Claim 3
Dependent Claim
31 words
The dental implant of claim 1, wherein said expanded polytetrafluoroethylene gingival interface has an average fibril length greater than about 60 microns and a density of less than about 1 g/cc.
Claim 4
Dependent Claim
38 words
The dental implant of claim 1, wherein said expanded polytetrafluoroethylene gingival interface is a circular disc attached to and surrounding the junction of said root structure and said cervical segment at the apical end of said cervical segment.
Claim 5
Dependent Claim
38 words
The dental implant of claim 1, wherein said expanded polytetrafluoroethylene gingival interface is a concentric cylinder attached to and surrounding the junction of said root structure and said cervical segment at the apical end of said cervical segment.
Claim 6
Dependent Claim
54 words
The dental implant of claim 1, wherein said cervical segment is formed from a biocompatible, nonporous material which penetrates the porous structure of said expanded polytetrafluoroethylene gingival interface and adheres said expanded polytetrafluoroethylene gingival interface to the junction of said root structure and said cervical segment at the apical end of said cervical segment.
Claim 7
Dependent Claim
30 words
The dental implant of claim 1, wherein said cervical segment's perimeter is continuously curved and its cross section decreases apically, with the apical end contacting said expanded polytetrafluoroethylene gingival interface.
Claim 8
Dependent Claim
19 words
The dental implant of claim 1, wherein said root structure is a solid cylinder with a rounded apical end.
Claim 9
Dependent Claim
14 words
The dental implant of claim 1, wherein said root structure is a hollow cylinder.
Claim 10
Dependent Claim
13 words
The dental implant of claim 1, wherein said root structure is a blade.
Claim 11
Dependent Claim
45 words
The dental implant of claim 2, wherein said expanded polytetrafluoroethylene gingival interface has a methanol bubble point of less than about 3.5 psi and a density less than about 0.6 g/cc and a majority of nodes passing through the wall thickness of said expanded polytetrafluoroethylene.
Claim 12
Dependent Claim
14 words
The dental implant of claim 7, wherein said root structure has a porous surface.
Claim 13
Dependent Claim
16 words
The dental implant of claim 7, wherein said root structure contains apertures to promote bony ingrowth.
Claim 14
Dependent Claim
17 words
The dental implant of claim 7, wherein said root structure has a porous surface of sintered titanium.
Claim 15
Dependent Claim
14 words
The dental implant of claim 8, wherein said root structure has a porous surface.
Claim 16
Dependent Claim
16 words
The dental implant of claim 8, wherein said root structure contains apertures to promote bony ingrowth.
Claim 17
Dependent Claim
17 words
The dental implant of claim 8, wherein said root structure has a porous surface of sintered titanium.
Claim 18
Dependent Claim
14 words
The dental implant of claim 9, wherein said root structure has a porous surface.
Claim 19
Dependent Claim
16 words
The dental implant of claim 9, wherein said root structure contains apertures to promote bony ingrowth.
Claim 20
Dependent Claim
17 words
The dental implant of claim 9, wherein said root structure has a porous surface of sintered titanium.
Claim 21
Dependent Claim
43 words
The dental implant of claim 10, wherein said expanded polytetrafluoroethylene gingival interface has an average fibril length of about 100 to 150 microns and a methanol bubble point of about 0.9 to 0.1 psi and a density of about 0.3 to 0.1 g/cc.
Claim 22
Dependent Claim
20 words
The dental implant of claim 11, wherein said porous surface has an average pore diameter of 100 to 300 microns.
Claim 23
Dependent Claim
20 words
The dental implant of claim 14, wherein said porous surface has an average pore diameter of 100 to 300 microns.
Claim 24
Dependent Claim
20 words
The dental implant of claim 17, wherein said porous surface has an average pore diameter of 100 to 300 microns.
Claim 25
Dependent Claim
16 words
The dental implant of claim 1 wherein a majority of nodes pass through said wall thickness.
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |