US4645457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endodontic material and method
Assignee: Individual
•
Filing: 1983-10-19
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Granted: 1987-02-24
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Expires: 2003-10-19
Abstract
Abstract The invention herein comprises methods and products for attaching a crown replacement on an endodontically treated tooth. The superior surface of the tooth is shaped to receive the base of the crown replacement and an interior space is machined into the root canal to accept placement of a post. The instrumented area is then flushed with a chelating agent followed by an organic solvent. A cementing medium having great compressive strength is placed around a post fitted into the cavity. After the cement has set, a quantity of filler material is placed around the remaining exposed part of the post. This post forms the support for the crown replacement. If desired, a preformed crown replacement may be placed over the cemented structure until a permanent crown can be made.
Inventors
- 👤 Melvin Goldman
- 👤 Dan Nathanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:02
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/30; A61C5/00; A61C5/30; A61C5/35; A61C5/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
A method for placing a crown on a tooth comprising: preparing the tooth to accept a coronal replacement, preparing the tooth to accept an anchor structure, flushing said prepared area with a chelating agent selected from the group consisting of citric acid and ethylenediaminetetraacetic acid, then flushing said prepared area with a solvent selected from the group consisting of sodium hypochlorite, surface active agents and emulsifiers, which solvent dissolves, dispenses or otherwise chemically removes organtic debris, placing a luting agent in said prepared area, placing said anchor structure in said prepared area, contacting said anchor structure and the dentin of the tooth with a luting agent, forming a core around the exposed anchor portion, and installing a coronal replacement.
Claim 2
Independent Claim
119 words
A method for placing a crown on a tooth comprising: preparing the tooth to accept a coronal replacement, preparing the tooth to accept an anchor structure, flushing said prepared area with a chelating agent selected from the group consisting of citric acid and ethylenediaminetetraacetic acid, then flushing said prepared area with a solvent selected from the group consisting of sodium hypochlorite, surface active agents and emulsifiers, which solvent dissolves, dispenses or otherwise chemically removes organtic debris, placing a luting agent in said prepared area, placing said anchor structure in said prepared area, contacting said anchor structure and the dentin of the tooth with a luting agent, forming a core around the exposed anchor portion, and installing a coronal replacement.
Claim 3
Dependent Claim
12 words
A method of claim 1 wherein said chelating agent is ethylenediaminetetraacetic acid.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein said chelating agent comprises about 1 to 50% by weight of ethylenediaminetetraacetic acid.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein said organic solvent is sodium hypochlorite.
Claim 6
Dependent Claim
18 words
The method of claim 4 wherein said organic solvent is about 1 to 20% by weight sodium hydrochlorite.
Claim 7
Dependent Claim
17 words
The method of claim 4 wherein said organic solvent is about 4-6% by weight of sodium hypochlorite.
Claim 8
Dependent Claim
19 words
The method of claim 1 wherein the chelating agent comprises about 10 to 16% by weight of ethylenediaminetetraacetic acid.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein said anchor structure comprises a threaded post and threaded nut thereof.
Claim 10
Dependent Claim
12 words
The method of claim 1 wherein said luting agent is Bis-GMA resin.
Claim 11
Dependent Claim
17 words
The method of claim 1 wherein said dentin preparation is accompanied by flushing with an irrigation solution.
Claim 12
Dependent Claim
13 words
The method of claim 10 wherein said irrigation solution is an organic solvent.
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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |