Patent US4283176A successfully refreshed from Google Patents.
US4283176A
Expired / Lapsed
US
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Endodontic-prosthetic stabilization system
Assignee: Individual
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Filing: 1979-02-21
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Granted: 1981-08-11
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Expires: 1999-02-21
Abstract
Abstract An endodontic implant comprises a smooth, non-threaded partially tapered shank having an integral crown portion on which an artificial tooth crown or denture is supported. The shank is implanted in the root canal of a tooth stump and through its apex into the jawbone of a patient. The shank is preferably provided with two tapered sections with an intermediate section of constant diameter and is dimensioned so as to occupy the whole of a root canal cavity when implanted therein. Preferably the implants are used in pairs, rigidly connected by a bar device to which a denture can be removably attached. The system anchors mobile teeth and prevents root resorption caused by instability.
Inventors
- 👤 Tibor T. Vajda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:20
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
An endodontic implant for stabilizing a tooth which comprises a smooth non-threaded partially tapered shank having first and second ends, and a crown portion of circular cross-section integral with said first end of the shank, the shank comprising two tapered sections separated by a section of constant diameter, the first tapered section having a length of substantially 3 mm and tapering from the crown portion towards said constant diameter section and the second tapered section tapering from said constant diameter section towards said second end of the shank, the second tapered section having a length of substantially 16 mm and tapering constantly along its length such that its diameter where it meets said constant diameter section is substantially 0.3 mm greater than its diameter at said second end; the shank being adapted for implantation in a root canal of a tooth stump and being of a length such that the second tapered section passes through the apex of said root canal into the adjacent jawbone of a patient, whereby the tooth may be immobilized for supporting in a rigid manner an artificial tooth crown or a means for supporting a denture, the tapers of the implant shank being such that when implanted in the root canal of a tooth the whole of the root canal cavity is occupied by the shank.
Claim 2
Dependent Claim
221 words
An endodontic implant for stabilizing a tooth which comprises a smooth non-threaded partially tapered shank having first and second ends, and a crown portion of circular cross-section integral with said first end of the shank, the shank comprising two tapered sections separated by a section of constant diameter, the first tapered section having a length of substantially 3 mm and tapering from the crown portion towards said constant diameter section and the second tapered section tapering from said constant diameter section towards said second end of the shank, the second tapered section having a length of substantially 16 mm and tapering constantly along its length such that its diameter where it meets said constant diameter section is substantially 0.3 mm greater than its diameter at said second end; the shank being adapted for implantation in a root canal of a tooth stump and being of a length such that the second tapered section passes through the apex of said root canal into the adjacent jawbone of a patient, whereby the tooth may be immobilized for supporting in a rigid manner an artificial tooth crown or a means for supporting a denture, the tapers of the implant shank being such that when implanted in the root canal of a tooth the whole of the root canal cavity is occupied by the shank.
Claim 3
Dependent Claim
66 words
A system comprising two or more implants according to claim 1 with a bar attachment adapted to be screwed to the crown portions of such implants, the bar attachment having cups which fit tightly over the crown portions of said implants, the cups being securable to the crown portions by means of screws passing horizontally through the bar attachment into transverse bores in the crown portions.
Claim 4
Dependent Claim
16 words
A system according to claim 2 in combination with a denture adapted to be attached thereto.
Claim 5
Dependent Claim
19 words
An implant according to claim 1 wherein the crown portion of the implant is bevelled on the labial side.
Claim 6
Dependent Claim
18 words
An implant according to claim 1 wherein the crown portion extends approximately 2 millimeters above the gingival level.
Claim 7
Dependent Claim
41 words
An implant according to claim 5 wherein a transverse screwed bore is provided in the lingual side of the crown for accommodating a screw in threaded engagement therewith for attachment of an artificial tooth crown or means for supporting a denture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |