Patent US4515565A successfully refreshed from Google Patents.
US4515565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dentistry
Assignee: Individual
•
Filing: 1983-03-22
•
Granted: 1985-05-07
•
Expires: 2003-03-22
Abstract
Abstract A dental post assembly is for use in crown restoration of anterior teeth and includes a portion intended to screw-tap and engage in the root canal of the tooth and a bush screwthreadedly engaged with the post for insertion into a counter-bore in the upper end of the tooth to act as a lock nut and secure the post in position. FIG. 2 shows the installed dental post in a crowned tooth.
Inventors
- 👤 Peter H. Winter-Moore
- 👤 Fernando J. Sanchez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:02
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
A dental post assembly comprising a post which (a) has its lower end tapered and provided with a barbed self-tapping screwthread having its trailing face reentrant for self-anchoring in an inwardly-tapering hole in a tooth root, and (b) has a bush threaded on its upper end for engagement in a counterbore in said hole to serve as a lock nut in cooperation with said self-anchoring screwthread.
Claim 2
Dependent Claim
66 words
A dental post assembly comprising a post which (a) has its lower end tapered and provided with a barbed self-tapping screwthread having its trailing face reentrant for self-anchoring in an inwardly-tapering hole in a tooth root, and (b) has a bush threaded on its upper end for engagement in a counterbore in said hole to serve as a lock nut in cooperation with said self-anchoring screwthread.
Claim 3
Dependent Claim
30 words
A post as claimed in claim 1 provided with a coarse screwthread for use in anchoring the post to the tooth and a fine screwthread for engagement with the bush.
Claim 4
Dependent Claim
23 words
A post as claimed in claim 2 wherein the two screwthreads are superimposed over at least part of the length of the post.
Claim 5
Dependent Claim
16 words
A post as claimed in claim 1 wherein the bush is textured on its outer surface.
References Cited (Backward Citations)
FR931255A
Cited
US4348183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |