US4591384A
Expired / Lapsed
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Dental cement compositions
Assignee: GC Corp
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Filing: 1984-07-19
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Granted: 1986-05-27
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Expires: 2004-07-19
Abstract
Abstract A dental cement composition comprises a first ingredient containing as the main component a metal oxide and a second ingredient capable of reacting with the first ingredient to form a set mass, and further contains a tannic acid derivative that is sparingly soluble in water and a reducing agent that is soluble in water. The instant cement composition may contain an aluminum salt to improve the properties thereof.
Inventors
- 👤 Shoji Akahane
- 👤 Kazuo Hirota
- 👤 Kentaro Tomioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:50
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/849; A61K6/864; A61K6/831; A61K6/838; A61K6/876; A61K6/884; A61K6/887; A61K6/889
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
In a dental cement composition comprising: (a) a first ingredient containing as the main component a metal oxide and (b) a second ingredient capable of reacting with the first ingredient to form a set mass, the improvement comprising, as said second ingredient, a mixture of; (I) a tannic acid derivative that is sparingly soluble in water selected from the group consisting of a tannic acid/protein complex, a tannic acid/formaldehyde reaction product, acetyl tannate, a metal tannate or a mixture thereof, and (II) a water-soluble reducing agent selected from the group consisting of a stannous tin salt, formic acid, oxalic acid and a salt of phosphorous or hypophosphorous acids.
Claim 2
Dependent Claim
108 words
In a dental cement composition comprising: (a) a first ingredient containing as the main component a metal oxide and (b) a second ingredient capable of reacting with the first ingredient to form a set mass, the improvement comprising, as said second ingredient, a mixture of; (I) a tannic acid derivative that is sparingly soluble in water selected from the group consisting of a tannic acid/protein complex, a tannic acid/formaldehyde reaction product, acetyl tannate, a metal tannate or a mixture thereof, and (II) a water-soluble reducing agent selected from the group consisting of a stannous tin salt, formic acid, oxalic acid and a salt of phosphorous or hypophosphorous acids.
Claim 3
Dependent Claim
42 words
The composition of claim 1, wherein the amounts of said tannic acid derivative and said reducing agent are in the ranges of 0.005 to 10 weight % and 0.005 to 5 weight %, respectively, based on the total weight of said composition.
Claim 4
Dependent Claim
20 words
The composition of claim 2, wherein said tannic acid derivative and said reducing agent are incorporated into the first ingredient.
Claim 5
Dependent Claim
42 words
The composition of claim 3, wherein the amounts of said tannic acid derivative and said reducing agent are in the ranges of 0.01 to 5 weight % and 0.01 to 5 weight %, respectively, based on the weight of the first ingredient.
Claim 6
Dependent Claim
112 words
In a dental cement composition comprising (a) a first ingredient containing a metal oxide as the main component and (b) a second ingredient capable of reacting with the first ingredient to form a set mass, the improvement comprising, as said second ingredient, a mixture of; (I) a tannic acid derivative that is sparingly soluble in water selected from the group consisting of a tannic acid/protein complex, a tannic acid/formaldehyde reaction product acetyl tannate, a metal tannate or a mixture thereof, (II) a water-soluble reducing agent selected from the group consisting of a stannous tin salt, formic acid, oxalic acid and a salt of phosphorous or hypophosphorous acids, and (III) an aluminium salt.
Claim 7
Dependent Claim
112 words
In a dental cement composition comprising (a) a first ingredient containing a metal oxide as the main component and (b) a second ingredient capable of reacting with the first ingredient to form a set mass, the improvement comprising, as said second ingredient, a mixture of; (I) a tannic acid derivative that is sparingly soluble in water selected from the group consisting of a tannic acid/protein complex, a tannic acid/formaldehyde reaction product acetyl tannate, a metal tannate or a mixture thereof, (II) a water-soluble reducing agent selected from the group consisting of a stannous tin salt, formic acid, oxalic acid and a salt of phosphorous or hypophosphorous acids, and (III) an aluminium salt.
Claim 8
Dependent Claim
41 words
The composition of claim 5, in which the amounts of said tannic acid derivative, said reducing agent and said aluminium salt are 0.005-10% by weight, 0.005-5% by weight and 0.005-5% by weight, respectively, based on the total weight of said composition.
Claim 9
Dependent Claim
22 words
The composition of claim 6, in which said tannic acid derivative and said reducing agent are both contained in the first ingredient.
Claim 10
Dependent Claim
39 words
The composition of claim 7, in which the amounts of said tannic acid derivative and said reducing agent are in the ranges of 0.01-5% by weight and 0.01-5% by weight, respectively, based on the weight of the first ingredient.
Claim 11
Dependent Claim
34 words
A composition as defined in claim 5, in which said aluminium salt is one or more selected from the group consisting of aluminium sulfate, aluminium nitrate, aluminium chloride, alum, aluminium citrate and aluminium fluoride.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |