Investments for dental casting

Details Investments for dental casting Investments for dental casting

1987-11-12

1989-03-21

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 35, 106114, 106121, 501 1, B22C 108

Patent

active

048140112

ABSTRACT:
An investment for dental casting comprises a mixture of at least one refractory selected from alumina, zirconia, magnesia clinker, quartz, cristobalite and fused quartz with either a mixture of a soluble phosphate with magnesium oxide or hemi-hydrate gypsum, which act as a binder. The investment of the invention further contains 0.5 to 5 parts by weight of raw starch (original starch) and 0.1 to 50 parts by weight of at least one selected from the group consisting of carbides, nitrides, borides, silicides and sulfides of transition metals of Groups IV, V and VI in the periodic table, which are added as expanding agents to 100 parts by weight of the aforesaid mixture. The investment of the invention may still further contain 0.1 to 1 part by weight of soluble starch.

REFERENCES:
patent: 3649732 (1972-03-01), Brigham et al.
patent: 4235633 (1980-11-01), Tomioka et al.
patent: 4604142 (1986-08-01), Kamohara et al.

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