A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
83/22
A61C 13/00 (2006.01) A61C 13/225 (2006.01)
Patent
CA 1275835
ABSTRACT OF THE DISCLOSURE: A denture base contains am elastic support for supporting at least one artificial tooth and fittings fixed to the elastic support for removably positioning the denture base. The elastic support is made of a hydrogel prepared by a process comprising a casting step of casting into a mold an aqueous solution containing more than 5 wt% and not more than 40 wt% of a polyvinyl alcohol having a degree of hydrolysis of not less than 95 mol% and an average polymerization degree of not less than 700, a freezing step of cooling the cast aqueous solution to a temperature of not higher than - (minus) 10°C to obtain a frozen mass, a thawing step of thawing the frozen mass, and one to seven additional cyclic processing steps each including the freezing and thawing steps.
522899
Kuwabara Osamu
Nambu Masao
Ohban Toshiyuki
Okuno Yoshihiko
Kuwabara Osamu
Marks & Clerk
Nambu Masao
Nippon Oil Co. Ltd.
Ohban Toshiyuki
LandOfFree
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