US4661065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft denture liner
Assignee: GULF SOUTH RESEARCH INSTITUTE 7600 GSRI AVENUE BATON ROUGE LA 70820 A NOT FOR PROFIT CORP OF LA
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Filing: 1985-12-04
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Granted: 1987-04-28
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Expires: 2005-12-04
Abstract
Abstract The invention provides a denture liner composition for a composite denture based on a phosphonitrilic fluoroelastomer [poly(fluoroalkoxy)phosphazene] curable at atmospheric pressure at temperatures of about 100° C. or less, conveniently by immersing the packed denture flask in a water bath at the appropriate temperature. The composition includes trimethacrylate and dimethacrylate cross-linking agents for increasing liner hardness and decreasing water sorption characteristics of the cured liner. The composition preferably further includes filler materials for increasing the hardness of the liner product. The composite denture is preferably prepared in a one-step process wherein the liner composition material of a single firmness is cured in situ with the denture base material. Alternatively, a firm liner material is cured at the periphery of the denture, and a softer liner material cured at the center; this provides a firm elastic liner adjustable by grinding where soft tissues must be displaced, and a soft elastic liner over bony anatomy, where stresses from chewing are most concentrated and soft tissues are thin. Another possibility lies in curing the soft liner directly to a precured denture as a reline procedure in an pre-existing denture.
Inventors
- 👤 Lawrence Gettleman
- 👤 Paul H. Gebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:54
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0025; A61K; A61K6/00; A61K6/30; A61K6/35; A61K6/80; A61K6/884
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
30 words
In a curable denture liner of the type consisting essentially of a phosphonitrilic fluoroelastomer, and at least one dimethacrylate cross-linking agent, the improvement comprising at least one trimethacrylate cross-linking agent.
Claim 2
Dependent Claim
30 words
In a curable denture liner of the type consisting essentially of a phosphonitrilic fluoroelastomer, and at least one dimethacrylate cross-linking agent, the improvement comprising at least one trimethacrylate cross-linking agent.
Claim 3
Dependent Claim
42 words
The liner of claim 1 wherein the fluoroelastomer is present in an amount of from about 30% to about 90% by weight, and the dimethacrylate and trimethacrylate are present in a total amount of from about 5.5% to about 24% by weight.
Claim 4
Dependent Claim
37 words
The denture liner of claim 2 wherein the fluoroelastomer is characterized by a plurality of repeating units of the general formula ##STR3## wherein n is 3, 5, 7, 9 or 11 and m is 10,000 to 50,000.
Claim 5
Dependent Claim
9 words
The liner of claim 1 further including a filler.
Claim 6
Dependent Claim
30 words
The liner of claim 1 further including a free-radical initiator comprising lauroyl peroxide or benzoyl peroxide, wherein the composition is curable under atmospheric conditions at about 100° C. or less.
Claim 7
Dependent Claim
25 words
The liner of claim 1, wherein the dimethacrylate cross-linking agent is a glycol ester of dimethacrylic acid, and the trimethacrylate cross-linking agent is trimethylolpropan trimethacrylate.
Claim 8
Dependent Claim
14 words
The liner of claim 6 wherein the dimethacrylate cross-linking agent is ethylene glycol dimethacrylate.
Claim 9
Dependent Claim
21 words
The liner of claim 7 wherein the ratio of ethylene glycol dimethacrylate to trimethylolpropane trimethacrylate is from about 4:1 to 1:40.
Claim 10
Dependent Claim
48 words
The liner of claim 7 wherein the ethylene glycol dimethacrylate is present in an amount of from about 0.5% to 20% by weight of the total composition and the trimethylolpropane trimethacrylate is present in an amount of from about 5% to 20% by weight of the total composition.
Claim 11
Dependent Claim
9 words
The liner of claim 6, further including a filler.
Claim 12
Dependent Claim
63 words
The liner of claim 10, wherein the filler is present in an amount of from about 10% to about 12%, the ethylene glycol dimethacrylate is present in an amount of from about 2% to about 4% and the trimethylolpropane trimethacrylate is present in an amount of from about 18% to 20%, wherein all amounts are expressed in percent by weight of the composition.
Claim 13
Dependent Claim
15 words
The liner of claim 6, wherein the filler comprises particles of a hard acrylic resin.
Claim 14
Dependent Claim
11 words
The liner of claim 6, wherein the filler comprises barium sulfate.
Claim 15
Dependent Claim
9 words
The liner of claim 4 further including a pigment.
Claim 16
Dependent Claim
20 words
A composite denture including a liner comprising the cured liner of claim 1 bonded to a cured denture base material.
Claim 17
Dependent Claim
18 words
The composite denture of claim 15 wherein the denture base material is primarily a poly(methyl methacrylate) denture base.
Claim 18
Dependent Claim
24 words
The composite denture of claim 15, wherein the liner and denture base material are cured together to bond the liner to the denture base.
Claim 19
Dependent Claim
23 words
The composite denture of claim 15, wherein the liner comprises a fluoroelastomer compounded with a glycol ester of dimethacrylic acid and trimethylolpropane trimethacrylate.
Claim 20
Dependent Claim
13 words
The composite denture of claim 18, wherein the liner further includes a filler.
Claim 21
Dependent Claim
25 words
The composite denture of claim 15, wherein the composition is curable under atmospheric conditions in a closed denture flask at about 100° C., or less.
Claim 22
Dependent Claim
17 words
The composite denture of claim 18, wherein the glycol ester of dimethacrylic acid is ethylene glycol dimethacrylate.
Claim 23
Dependent Claim
23 words
The composite denture of claim 18, wherein the ratio of trimethacrylate to dimethacrylate in the liner is from about 40:1 to about 1:4.
Claim 24
Dependent Claim
94 words
A method for forming a substantially non-toxic composite denture of claim 15 of improved physical characteristics comprising: (a) lining denture base material with a denture liner comprising a phosphonitrilic fluoroelastomer, at least one dimethacrylate cross-linking agent and at least one trimethacrylate cross-linking agent curable at a temperature of 100° C. or less under atmospheric pressure; and (b) subjecting the lined denture base material to a temperature of about 100° C. or less at atmospheric pressure to cure the denture liner and bond the liner to the denture base material to form a composite denture.
Claim 25
Dependent Claim
36 words
The method of claim 23 wherein the fluoroelastomer is characterized by a plurality of repeating units of the formula ##STR4## wherein n is 3, 5, 7, 9 or 11, and m is between 10,000 and 50,000.
Claim 26
Dependent Claim
32 words
The method of claim 23, wherein the surface of the curable denture base material is wetted with a C 1 -C 6 alkyl monomethacrylate monomer before lining with the dentur liner material.
Claim 27
Dependent Claim
11 words
The method of claim 23, wherein the trimethacrylate is trimethlolpropane trimethacrylate.
Claim 28
Dependent Claim
15 words
The method of claim 26 wherein the dimethacrylate is a glycol ester of dimethacrylic acid.
Claim 29
Dependent Claim
13 words
The method of claim 23, wherein the liner further includes a free-radical initiator.
Claim 30
Dependent Claim
30 words
The method of claim 27 wherein the glycol ester of dimethacrylic acid is a polyethylene glycol ester, a 1,6-hexamethylene glycol ester, an ethylene glycol ester, or a tetraethylene glycol ester.
Claim 31
Dependent Claim
12 words
The method of claim 23, wherein the liner further includes a filler.
Claim 32
Dependent Claim
16 words
The method of claim 29 wherein the glycol ester of dimethacrylic acid is ethylene glycol dimethacrylate.
Claim 33
Dependent Claim
21 words
The method of claim 30, wherein the filler comprises particles of a hard acrylic resin, or BaSO 4 , or both.
Claim 34
Dependent Claim
18 words
The method of claim 23, wherein the denture base material is primarily a poly(methyl methacrylate) denture base dough.
Claim 35
Dependent Claim
14 words
The method of claim 28, wherein the initiator is lauroyl peroxide or benzoyl peroxide.
Claim 36
Dependent Claim
21 words
The method of claim 23, wherein the denture base material of paragraph (a) is precured before lining with the denture liner.
Claim 37
Dependent Claim
41 words
The method of claim 23, wherein the denture base material of paragraph (a) is a curable denture base material which is concurrently cured with the denture liner to bond the liner and denture base material together in accordance with paragraph (b).
Claim 38
Dependent Claim
14 words
The method of claim 35, wherein the precured denture base is a pre-existing denture.
Claim 39
Dependent Claim
37 words
The liner of claim 9, wherein the dimethcrylate is present in an amount of from about 2 to 4% by weight and the trimethacrylate is present in an amount of from about 18 to 20% by weight.
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) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |