US4579880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental cavity filling composite material
Assignee: Nihon University
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Filing: 1984-04-24
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Granted: 1986-04-01
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Expires: 2004-04-24
Abstract
Abstract A dental filling composite material is disclosed, which contains 10-99% by weight of phosphazene of the formula: <IMAGE> in which at least one of R1 and R2 represent radicals having not less than 3 carbon atoms and being polymerizable. The filling composite material is low in polymerization shrinkage, thermal expansion coefficient and water absorption and may be quickly polymerized and cured to form a polymer of high compressive strength, flexural strength and hardness.
Inventors
- 👤 Masayoshi Ohashi
- 👤 Misaki Anzai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:25
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; A; A61; A61K; A61K6/00; A61K6/70; A61K6/71; A61K6/76
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A dental cavity filling composite material comprising: the copolymerization reaction product of a phosphazene monomer having the formula: ##STR8## in which at least one of R 1 and R 2 is a polymerizable radical having not less than 3 carbon atoms, a copolymerizable monomer selected from the group consisting of acrylic acid, esters of acrylic acid, methacrylic acid, esters of methacrylic acid and mixtures thereof and a polyfunctional copolymerizable monomer selected from the group consisting of triethylene glycol dimethacrylate, bisphenol-A diglicydyl glycol dimethacrylate, trimethylol propane trimethacrylate, tetramethylol methane tetraacrylate and mixtures thereof.
Claim 2
Dependent Claim
92 words
A dental cavity filling composite material comprising: the copolymerization reaction product of a phosphazene monomer having the formula: ##STR8## in which at least one of R 1 and R 2 is a polymerizable radical having not less than 3 carbon atoms, a copolymerizable monomer selected from the group consisting of acrylic acid, esters of acrylic acid, methacrylic acid, esters of methacrylic acid and mixtures thereof and a polyfunctional copolymerizable monomer selected from the group consisting of triethylene glycol dimethacrylate, bisphenol-A diglicydyl glycol dimethacrylate, trimethylol propane trimethacrylate, tetramethylol methane tetraacrylate and mixtures thereof.
Claim 3
Dependent Claim
15 words
A filling composite material according to claim 1, wherein the phosphazene has the formula: ##STR9##
Claim 4
Dependent Claim
14 words
The filling composite material of claim 2, wherein the phosphazene has the formula: ##STR10##
Claim 5
Dependent Claim
11 words
The filing composite material of claim 1 further comprising a filler.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |