Patent US4280842A successfully refreshed from Google Patents.
US4280842A
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Dental-cement composition and method of preparing and using same
Assignee: ADA Forsyth Institute Inc
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Filing: 1979-03-19
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Granted: 1981-07-28
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Expires: 1999-03-19
Abstract
Abstract A premixed, dental-cement composition, which cement composition comprises a chelate of a metal and hydroxybenzophenone, particularly a zinc hydroxybenzophenone chelate; a filler material, particularly a metal oxide and preferably a metal oxide which is the same as that of the metal hydroxybenzophenone chelate; and a modifier, which dental-cement composition may be heated reversibly between a solid and a liquid state, is premixed and exhibits reduced irritation and solubility over the ordinary dental cements of the prior art.
Inventors
- 👤 Floyd E. Dewhirst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:32
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/849; A61K6/876; A61K6/884; A61K6/887; A61K6/889
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
107 words
A premixed dental-cement composition adapted for use in the oral cavity of a patient, which dental-cement composition comprises in combination: (a) a metal oxide-hydroxybenzophenone chelate compound; (b) a dental filler material which comprises a metal oxide in an amount sufficient to provide additional strength to the composition, so that it may be employed as a dental cement; said dental-cement composition having a eutectic temperature of from about 100° F. to about 125° F. and characterized by being reversibly changed between a hard solid state, suitable for use as a dental cement, to a liquid state, suitable for application as a dental cement within the eutectic temperature range.
Claim 2
Dependent Claim
107 words
A premixed dental-cement composition adapted for use in the oral cavity of a patient, which dental-cement composition comprises in combination: (a) a metal oxide-hydroxybenzophenone chelate compound; (b) a dental filler material which comprises a metal oxide in an amount sufficient to provide additional strength to the composition, so that it may be employed as a dental cement; said dental-cement composition having a eutectic temperature of from about 100° F. to about 125° F. and characterized by being reversibly changed between a hard solid state, suitable for use as a dental cement, to a liquid state, suitable for application as a dental cement within the eutectic temperature range.
Claim 3
Dependent Claim
17 words
The dental-cement composition of claim 1 wherein the metal oxide-hydroxybenzophenone chelate comprises a zinc oxide-hydroxybenzophenone chelate compound.
Claim 4
Dependent Claim
18 words
The dental-cement composition of claim 1 wherein the metal oxide-hydroxybenzophenone chelate compound comprises a zinc oxide-2-hydroxy-4-methoxybenzophenone chelate compound.
Claim 5
Dependent Claim
25 words
The dental-cement composition of claim 1 wherein the metal of the metal oxide filler material is the same metal oxide as in the chelate compound.
Claim 6
Dependent Claim
23 words
The dental-cement composition of claim 1 wherein the dental filler material comprises from about 60% to 70% by weight of the dental-cement composition.
Claim 7
Dependent Claim
28 words
The dental-cement composition of claim 1 wherein the hydroxybenzophenone is selected from the group consisting of: 2-hydroxybenzophenone; 2-hydroxy-4-methoxybenzophenone; 2-hydroxy-4-octyloxybenzophenone; 2-hydroxy-5-methylbenzophenone; 5-chloro-2-hydroxybenzophenone; 2-hydroxy-4'-chlorobenzophenone; 5-chloro-2-hydroxy-4-methylbenzophenone; 4'-chloro-2-hydroxy-4-methoxybenzophenone; 2-hydroxy-4-methoxy-4'-methylbenzophenone; and combinations thereof.
Claim 8
Dependent Claim
24 words
The dental-cement composition of claim 1 wherein the total weight ratio of the metal oxide to hydroxybenzophenone in the composition ranges up to 6:1.
Claim 9
Dependent Claim
34 words
The dental-cement composition of claim 1 wherein the dental filler material comprises zinc oxide, and the total weight ratio of the zinc oxide to hydroxybenzophenone in the composition ranges from about 2:1 to 4:1.
Claim 10
Dependent Claim
25 words
The dental-cement composition of claim 1 wherein the metal oxide is zinc oxide, and which dental-cement composition has a eutectic temperature of about 50° C.
Claim 11
Dependent Claim
33 words
The dental-cement composition of claim 1 wherein the metal oxide comprises a metal selected from the group consisting of zinc, barium, magnesium calcium, strontium, beryllium, nickel, cobalt, cadmium, mercury, tin and combinations thereof.
Claim 12
Dependent Claim
29 words
The dental-cement composition of claim 1 wherein the metal oxide of the chelate compound comprises zinc oxide, and wherein the dental filler material comprises aluminum oxide and zinc oxide.
Claim 13
Dependent Claim
25 words
The dental-cement composition of claim 1 which includes a dental composition modifying agent to modify the preparation, handling or working properties of the dental-cement composition.
Claim 14
Dependent Claim
21 words
The dental-cement composition of claim 12 wherein the modifying agent includes rosin, glycerine, fatty acids, fatty-acid soaps, petroleum or combinations thereof.
Claim 15
Dependent Claim
101 words
A premixed dental-cement composition adapted for use in the oral cavity of a patient, which dental-cement composition comprises in combination: (a) a zinc oxide-hydroxybenzophenone chelate compound; (b) a metal oxide dental filler material in an amount sufficient to provide sufficient strength to the dental-cement composition for use as a dental cement; said dental-cement composition having a eutectic temperature of from about 100° F. to about 125° F. and characterized by being reversibly changed between a hard solid state, suitable for use as a dental cement, to a liquid state, useful for application of the dental cement within the eutectic temperature range.
Claim 16
Dependent Claim
101 words
A premixed dental-cement composition adapted for use in the oral cavity of a patient, which dental-cement composition comprises in combination: (a) a zinc oxide-hydroxybenzophenone chelate compound; (b) a metal oxide dental filler material in an amount sufficient to provide sufficient strength to the dental-cement composition for use as a dental cement; said dental-cement composition having a eutectic temperature of from about 100° F. to about 125° F. and characterized by being reversibly changed between a hard solid state, suitable for use as a dental cement, to a liquid state, useful for application of the dental cement within the eutectic temperature range.
Claim 17
Dependent Claim
19 words
The dental-cement composition of claim 14 wherein the metal oxide dental filler material comprises aluminum oxide and zinc oxide.
Claim 18
Dependent Claim
27 words
The dental-cement composition of claim 14 wherein the metal oxide dental filler material includes zinc oxide, the dental-cement composition having a eutectic temperature of about 50° C.
Claim 19
Dependent Claim
29 words
The dental-cement composition of claim 14 wherein the total weight ratio of the metal oxide and zinc oxide to hydroxybenzophenone in the composition ranges from about 2:1 to 4:1.
Claim 20
Dependent Claim
23 words
The dental-cement composition of claim 17 wherein the hydroxybenzophenone comprises a 2-hydroxy-4-methoxybenzophenone, and wherein the metal oxide dental filler material comprises zinc oxide.
Claim 21
Dependent Claim
28 words
The dental-cement composition of claim 14 wherein the hydroxybenzophenone is selected from the group consisting of: 2-hydroxybenzophenone; 2-hydroxy-4-methoxybenzophenone; 2-hydroxy-4-octyloxybenzophenone; 2-hydroxy-5-methylbenzophenone; 5-chloro-2-hydroxybenzophenone; 2-hydroxy-4'-chlorobenzophenone; 5-chloro-2-hydroxy-4-methylbenzophenone; 4'-chloro-2-hydroxy-4-methoxybenzophenone; 2-hydroxy-4-methoxy-4'-methylbenzophenone; and combinations thereof.
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) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |