Patent US4538990A successfully refreshed from Google Patents.
US4538990A
Expired / Lapsed
US
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Method of decreasing the permeability of a dental cavity
Assignee: Augusta University Research Institute Inc
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Filing: 1984-09-24
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Granted: 1985-09-03
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Expires: 2004-09-24
Abstract
Abstract A method of decreasing the permeability of dental cavity preparations comprising the steps of first applying from 1 to 30% w/v neutral oxalate salt solution, such as dipotassium oxalate to the smear layer and then applying 0.5 to 3% w/v of an acidic oxalate salt solution, such as a monopotassium monohydrogen oxalate, to the layer. The resultant layer of microscopic calcium oxalate crystals makes the dentin surface more resistant to acid attack.
Inventors
- 👤 David H. Pashley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:09
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K6/00; A61K6/20; A61K6/40; A61K8/00; A61K8/18; A61K8/30; A61K8/33; A61K8/36; A61K8/362
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A method of decreasing the permeability of a prepared dental cavity surface, comprising the steps of: (a) treating said cavity surface prior to receiving a restorative material with an effective amount of a neutral oxalate salt solution to form an acid resistant first surface; and (b) applying to said first surface, at a predetermined amount of time after step (a) an effective amount of an acidic oxalate salt solution to form an acid resistant second surface, thereby forming an acid resistant liner on said dental cavity surface.
Claim 2
Independent Claim
87 words
A method of decreasing the permeability of a prepared dental cavity surface, comprising the steps of: (a) treating said cavity surface prior to receiving a restorative material with an effective amount of a neutral oxalate salt solution to form an acid resistant first surface; and (b) applying to said first surface, at a predetermined amount of time after step (a) an effective amount of an acidic oxalate salt solution to form an acid resistant second surface, thereby forming an acid resistant liner on said dental cavity surface.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1 wherein the neutral oxalate salt is dipotassium oxalate.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 1 wherein said effective amount of said neutral oxalate solution ranges from 1% w/v to saturation of said solution.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 3 wherein the amount of said neutral solution is 30% w/v.
Claim 6
Dependent Claim
16 words
A method as claimed in claim 1 wherein said acidic oxalate salt is monopotassium monohydrogen oxalate.
Claim 7
Dependent Claim
22 words
A method as claimed in claim 1 wherein said effective amount of said acidic oxalate solution ranges from 0.5% to 3% w/v.
Claim 8
Dependent Claim
25 words
A method as claimed in claim 1 wherein said neutral oxalate salt is selected from the group consisting of alkalai metal oxalates and ammonium oxalates.
Claim 9
Dependent Claim
18 words
A method as claimed in claim 1 wherein the pH of said acidic oxalate salt solution is 1.
Claim 10
Dependent Claim
19 words
A method as claimed in claim 1 wherein said predetermined amount of time ranges from 1 to 2 minutes.
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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |