Claims
- 1. A cushioning sheet adapted for lining the gingival mucosa-facing surface of a polymethyl methacrylate denture base, said sheet consisting essentially of a copolymer consisting essentially of 40 to 60 parts by weight of vinylidene fluoride units, 20 to 30 parts by weight of tetrafluoroethylene units and 20 to 30 parts by weight of hexafluoropropylene units and/or chlorotrifluoroethylene units, said sheet being 0.2 to 3.0 mm in thickness and having a modulus of rigidity of 10 to 150 kg/cm.sup.2, a water absorbance of less than 0.05% and an adhesion strength of more than 250 kg/cm.sup.2.
- 2. A polymethyl methacrylate denture base having its gingival mucosa-facing surface lined with a cushioning sheet, said cushioning sheet consisting essentially of 40 to 60 parts by weight of vinylidene fluoride units, 20 to 30 parts by weight of tetrafluoroethylene units and 20 to 30 parts by weight of hexafluoropropylene units and/or chlorotrifluoroethylene units, said cushioning sheet being 0.2 to 3 mm in thickness and having a modulus of rigidity of 10 to 150 kg/cm.sup.2, a water absorbance of less than 0.05% and an adhesion strength of more than 250 kg/cm.sup.2.
CROSS-REFERENCE OF RELATED APPLICATION
The present application is a continuation-in-part of application Ser. No. 183,733 and now abandoned, filed on Sept. 3, 1980 which is a continuation-in-part of application Ser. No. 61,244, filed on July 27, 1979 and now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (13)
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Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
183733 |
Sep 1980 |
|
Parent |
61244 |
Jul 1979 |
|