Patent US4846685A successfully refreshed from Google Patents.
US4846685A
Expired / Lapsed
US
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Perforated dental post system
Assignee: Individual
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Filing: 1988-04-06
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Granted: 1989-07-11
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Expires: 2008-04-06
Abstract
Abstract A perforated dental post system is provided for anchoring a crown to the root of a tooth. This post consists of a shank with a spiral thread running lengthwise thereof. Serrations are provided on the shank. Flanges are provided at the upper end of the post. A central bore runs lengthwise of the post, and spaced transverse or perpendicular cross bores are provided in the post. When the bores are filled with cement and the outer wall of the post is coated with cement, the post can be anchored to the tooth root and to the crown. In a second embodiment of the dental post, a plurality of longitudinally extending grooves are provided in the surface of the post together with a plurality of shallow longitudinally and radially extending bores. When the various bores and grooves are filled with cement, they can be used to anchor the post in a tooth.
Inventors
- 👤 Howard Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:10
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
86 words
A dental post for anchoring a crown to the root of a tooth, comprising, shank means having substantially parallel sides extending longitudinally thereof, at least one protuberance positioned on the peripheral surface of said shank means and extending in a longitudinal direction of said shank means substantially lengthwise thereof, said shank means also being provided with spaced apertures arranged perpendicularly to said shank means, said spaced apertures in said shank means being positioned about said protuberance for anchoring said crown to said root of said tooth.
Claim 2
Dependent Claim
86 words
A dental post for anchoring a crown to the root of a tooth, comprising, shank means having substantially parallel sides extending longitudinally thereof, at least one protuberance positioned on the peripheral surface of said shank means and extending in a longitudinal direction of said shank means substantially lengthwise thereof, said shank means also being provided with spaced apertures arranged perpendicularly to said shank means, said spaced apertures in said shank means being positioned about said protuberance for anchoring said crown to said root of said tooth.
Claim 3
Dependent Claim
43 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, wherein said shank means is provided with a central bore therein extending substantially from the apex and to the coronal end of said shank means.
Claim 4
Dependent Claim
66 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, wherein a plurality of protuberances are provided on said shank means and consist of serrated threads arranged obliquely to the longitudinal direction of said shank means and a central bore extending from the apex of said shank means and exiting through the coronal end of said shank means.
Claim 5
Dependent Claim
37 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, and radially spaced longitudinally arranged bores positioned on the outer surface of said shank means and running lengthwise thereof.
Claim 6
Dependent Claim
47 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, and a plurality of shallow radially extending spaced bores positioned on the peripheral surface of said shank means and also spaced longitudinally along said length of said shank means.
Claim 7
Dependent Claim
31 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, wherein said protuberances are of spiral shape running lengthwise of said shank means.
Claim 8
Dependent Claim
40 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, wherein a plurality of longitudinally extending spaced channels are provided in the peripheral surface of said shank means for receiving cementitious material.
Claim 9
Dependent Claim
31 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 7, wherein said channels are equally spaced around the peripheral surface of said post.
Claim 10
Dependent Claim
31 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 7, wherein said channels are unequally spaced around the peripheral surface of said post.
Claim 11
Dependent Claim
43 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, and cementitious material positioned on said protuberances and said apertures for aiding in holding said shank means to said crown and root of said tooth.
Claim 12
Dependent Claim
48 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, wherein said protuberance on said shank means consists of spaced serration means arranged substantially perpendicularly to the longitudinal direction of said shank means and positioned in the longitudinal direction thereof.
Claim 13
Dependent Claim
38 words
A dental post for anchoring a crown to the root of a tooth as recited in claim 1, wherein said protuberance is a spiral positioned on the peripheral surface of said shank means and runs substantially lengthwise thereof.
Claim 14
Dependent Claim
31 words
A dental post for anchoring a crown to a root of a tooth as recited in claim 12, wherein said spiral is continuous on the peripheral surface of said shank means.
Claim 15
Dependent Claim
43 words
A dental post for anchoring a crown to a root of a tooth as recited in claim 12, wherein said protuberance consists of a plurality of spaced serrations arranged along the peripheral surface of said shank means and in the longitudinal direction thereof.
Claim 16
Dependent Claim
41 words
A dental post for anchoring a crown to a root of a tooth as recited in claim 12, wherein said protuberance consists of spaced flange means arranged along the peripheral surface of said shank means and in the longitudinal direction thereof.
References Cited (Backward Citations)
US430522A
Cited
US4759714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |