Gypsum composition for denture investment

Details Gypsum composition for denture investment Gypsum composition for denture investment

1985-08-30

1987-03-03

Lieberman, Paul

Compositions: coating or plastic

Coating or plastic compositions

Dental

106109, 106111, 4331991, C09K 300

Patent

active

046473114

ABSTRACT:
A gypsum composition for denture investment comprises 100 parts by weight of a mixture of 50-90 parts by weight of .alpha.-Gypsum hemihydrate (.alpha.-CaSO.sub.4.1/2H.sub.2 O) with 10-50 parts by weight of .beta.-Gypsum hemihydrate (.beta.-CaSO.sub.4.1/2H.sub.2 O) and 0.2-2.0 parts by weight of a soluble potassium salt and 0.5-3.0 parts by weight of mannitol. As the soluble potassium salt, use may be made of one or more of potassium sulfate, potassium chloride and potassium tartrate. The gypsum composition may further include 0.5-5.0 parts by weight of dihydrate gypsum.

REFERENCES:
patent: 3305375 (1967-02-01), Jakacki
patent: 4526619 (1985-07-01), Ohi et al.

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