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US4432730A Expired / Lapsed US ⏱️ 0.0 years remaining

Soft and firm denture liner for a composite denture and method for fabricating

Assignee: Gulf South Research Institute
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Filing: 1982-10-01
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Granted: 1984-02-21
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Expires: 2002-10-01
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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 100° C. or less, conveniently by immersing the packed denture flask in a water bath at the appropriate temperature. The composition includes filler materials for increasing the hardness of the cured liner, interpenetrating polymers for increasing firmness and bond strength, and cross-linking agents for increasing the tensile strength and bond strength of the cured liner. 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 may be cured at the periphery of the denture and a softer liner material cured at the center, in order to provide a firm elastic liner where adjustments must be made by grinding and where the patient's soft tissues must be displaced, and a soft elastic liner over the bony anatomy of the patient where stresses from chewing are most concentrated and the soft tissues are thin.

Inventors

  • 👤 Lawrence Gettleman
  • 👤 Charles L. Farris
  • 👤 H. Ralph Rawls
  • 👤 Ralph J. LeBouef, Jr.

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 04:59
CPC Classifications
C; C08; C08F; C08F283/00

Claims Analysis

Total Claims: 19
Claim 1
Independent Claim 95 words
Method for forming a substantially non-toxic composite denture of improved physical characteristics comprising: (a) lining a curable acrylate polymer denture base material with a denture liner material comprising a phosphonitrilic fluoroelastomer and an interpenetrating C 1 -C 6 alkyl methacrylate monomer composition 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 concurrently cure the denture liner material and denture base material and to bond them together to form a composite denture.
Claim 2
Dependent Claim 95 words
Method for forming a substantially non-toxic composite denture of improved physical characteristics comprising: (a) lining a curable acrylate polymer denture base material with a denture liner material comprising a phosphonitrilic fluoroelastomer and an interpenetrating C 1 -C 6 alkyl methacrylate monomer composition 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 concurrently cure the denture liner material and denture base material and to bond them together to form a composite denture.
Claim 3
Dependent Claim 36 words
The method of claim 1 wherein the fluoroelastomer is characterized by a plurality of repeating units of the formula ##STR6## wherein n is 3, 5, 7, 9 or 11, and m is between 10,000 and 50,000.
Claim 4
Dependent Claim 19 words
The method of claim 1 wherein the composition includes a glycol ester of dimethacrylic acid as a cross-linking agent.
Claim 5
Dependent Claim 13 words
The method of claim 3 wherein the interpenetrating monomer is methyl methacrylate monomer.
Claim 6
Dependent Claim 20 words
The method of claim 1 wherein the fluoroelastomer composition includes a free-radical initiator and an acid scavenger for the fluoroelastomer.
Claim 7
Dependent Claim 18 words
The method of claim 4 wherein the glycol is polyethylene glycol, 1,6-hexamethylene glycol, ethylene glycol, or tetraethylene glycol.
Claim 8
Dependent Claim 22 words
The method of claim 5 wherein the free-radical initiator is benzoyl peroxide or lauroyl peroxide, and the acid scavenger is magnesium oxide.
Claim 9
Dependent Claim 12 words
The method of claim 1 wherein the composition further includes a filler.
Claim 10
Dependent Claim 13 words
The method of claim 3 wherein the cross-linking agent is ethylene glycol dimethacrylate.
Claim 11
Dependent Claim 22 words
The method of claim 1 wherein an acrylic monomer is applied between the liner material and denture bases material prior to curing.
Claim 12
Dependent Claim 16 words
The method of claim 1 wherein the denture base material is poly(methyl methacrylate) denture base dough.
Claim 13
Dependent Claim 10 words
The invention of claim 8 wherein the filler is radiopaque.
Claim 14
Dependent Claim 11 words
The invention of claim 8 wherein the filler is barium sulfate.
Claim 15
Dependent Claim 9 words
The invention of claim 8 further including a pigment.
Claim 16
Dependent Claim 15 words
The method of claim 8, wherein the filler comprises particles of a hard acrylic resin.
Claim 17
Dependent Claim 19 words
The method of claim 15, wherein the composition includes a glycol ester of dimethacrylic acid as a cross-linking agent.
Claim 18
Dependent Claim 10 words
A composite denture produced by the method of claim 1.
Claim 19
Dependent Claim 18 words
The composite denture of claim 17 wherein the denture base material is a poly(methyl methacrylate) denture base dough.

References Cited (Backward Citations)

US2848750A Cited
US3702833A Cited
US3888799A Cited
US3945966A Cited
US4302376A Cited
US4251215A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-02-20 1987-08-22 1988-02-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-02-20 1991-08-22 1992-02-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-02-20 1995-08-22 1996-02-21 $7700.00 Window Closed / Lapsed

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