US5154762A
Expired / Lapsed
US
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Universal water-based medical and dental cement
Assignee: 3M Co
•
Filing: 1991-05-31
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Granted: 1992-10-13
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Expires: 2011-05-31
Abstract
Abstract Dental cement containing water, acid-reactive filler, water-miscible acidic polymer, an ethylenically-unsaturated moiety, photoinitiator, water-soluble reducing agent and water-soluble oxidizing agent. The cement has three curing modes, namely an acid-filler ionic reaction, a photoinitiated crosslinking reaction and a redox-initiated crosslinking reaction. The cement cures well in thick layers, and can be used without a dental curing light or with a light that is weak or defective.
Inventors
- 👤 Sumita B. Mitra
- 👤 Smarajit Mitra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:54
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/28; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889; C04B2111/00; C04B2111/00474; C04B2111/00836
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
48 words
A water-containing, ionically-hardenable, photocurable, ethylenically-unsaturated dental cement, comprising a) finely-divided acid-reactive filler, b) water-miscible acidic polymer, c) photoinitiator, d) water-soluble reducing agent, and e) water-soluble oxidizing agent, wherein the reducing agent and the oxidizing agent are capable of initiating gelation of a 10:10:1 weight basis water:acrylamide:methylene bis-acrylamide mixture.
Claim 2
Dependent Claim
48 words
A water-containing, ionically-hardenable, photocurable, ethylenically-unsaturated dental cement, comprising a) finely-divided acid-reactive filler, b) water-miscible acidic polymer, c) photoinitiator, d) water-soluble reducing agent, and e) water-soluble oxidizing agent, wherein the reducing agent and the oxidizing agent are capable of initiating gelation of a 10:10:1 weight basis water:acrylamide:methylene bis-acrylamide mixture.
Claim 3
Dependent Claim
16 words
A cement according to claim 1, wherein the filler comprises metal oxide, metal salt or glass.
Claim 4
Dependent Claim
12 words
A cement according to claim 2, wherein the glass comprises fluoroaluminosilicate glass.
Claim 5
Dependent Claim
18 words
A cement according to claim 1, wherein the polymer comprises a homopolymer or copolymer of an alkenoic acid.
Claim 6
Dependent Claim
21 words
A cement according to claim 4, wherein the polymer comprises a copolymer of acrylic acid containing one or more ethylenically-unsaturated groups.
Claim 7
Dependent Claim
14 words
A cement according to claim 1, containing as a further component an ethylenically-unsaturated monomer.
Claim 8
Dependent Claim
38 words
A cement according to claim 1, wherein the reducing agent is selected from the group consisting of ascorbic acid, cobalt (II) chloride, ferrous chloride, ferrous sulfate, hydrazine, oxalic acid, thiourea, and salts of a dithionite or sulfite anion.
Claim 9
Dependent Claim
15 words
A cement according to claim 1, wherein the reducing agent comprises ascorbic acid or thiourea.
Claim 10
Dependent Claim
37 words
A cement according to claim 1, wherein the oxidizing agent is selected from the group consisting of cobalt (III) chloride, tert-butyl hydroperoxide, ferric chloride, perboric acid and its salts, and salts of a permanganate or persulfate anion.
Claim 11
Dependent Claim
15 words
A cement according to claim 1, wherein the oxidizing agent comprises potassium or ammonium persulfate.
Claim 12
Dependent Claim
34 words
A cement according to claim 1, wherein the cement has two parts respectively containing glass and polymer, and one agent is packaged with the glass and the other agent is packaged with the polymer.
Claim 13
Dependent Claim
15 words
A cement according to claim 1, wherein at least one of the agents is microencapsulated.
Claim 14
Dependent Claim
25 words
A cement according to claim 12, wherein the cement has two parts respectively containing glass and polymer, and both agents are packaged with the glass.
Claim 15
Dependent Claim
25 words
A cement according to claim 12, wherein the cement has two parts respectively containing glass and polymer, and both agents are packaged with the polymer.
Claim 16
Dependent Claim
18 words
A cement according to claim 12, wherein at least one of the agents is microencapsulated with water-soluble encapsulant.
Claim 17
Dependent Claim
18 words
A cement according to claim 12, wherein at least one of the agents is microencapsulated with water-insoluble encapsulant.
Claim 18
Dependent Claim
13 words
A cement according to claim 16, wherein the encapsulant comprises cellulose acetate butyrate.
Claim 19
Dependent Claim
49 words
A cement according to claim 1, wherein the cement contains about 3% to about 25% water, about 25% to about 85% filler, about 10% to about 50% polymer, about 0.1% to about 5% photoinitiator, about 0.02% to about 5% reducing agent, and about 0.02% to about 5% oxidizing agent.
Claim 20
Dependent Claim
29 words
A cement according to claim 18, wherein the cement contains about 5% to about 20% water, about 50% to about 75% filler and about 10% to about 30% polymer.
Claim 21
Dependent Claim
46 words
A dental cement powder, comprising finely-divided acid-reactive filler, a water-soluble reducing agent and a water-soluble oxidizing agent, at least one of the agents being microencapsulated, wherein the reducing agent and the oxidizing agent are capable of initiating gelation of a 10:10:1 weight basis water:acrylamide:methylene bisacrylamide mixture.
Claim 22
Dependent Claim
46 words
A dental cement powder, comprising finely-divided acid-reactive filler, a water-soluble reducing agent and a water-soluble oxidizing agent, at least one of the agents being microencapsulated, wherein the reducing agent and the oxidizing agent are capable of initiating gelation of a 10:10:1 weight basis water:acrylamide:methylene bisacrylamide mixture.
Claim 23
Dependent Claim
46 words
A dental cement liquid, comprising water-miscible acidic polymer, a water-soluble reducing agent and a water-soluble oxidizing agent, at least one of the agents being microencapsulated, wherein the reducing agent and the oxidizing agent are capable of initiating gelation of a 10:10:1 weight basis water:acrylamide:methylene bis-acrylamide mixture.
Claim 24
Dependent Claim
46 words
A dental cement liquid, comprising water-miscible acidic polymer, a water-soluble reducing agent and a water-soluble oxidizing agent, at least one of the agents being microencapsulated, wherein the reducing agent and the oxidizing agent are capable of initiating gelation of a 10:10:1 weight basis water:acrylamide:methylene bis-acrylamide mixture.
Claim 25
Dependent Claim
11 words
A liquid according to claim 21, further comprising an ethylenically-unsaturated moiety.
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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) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |