| 摘要 |
A composition and method for preparing model bases in the manufacture of dental prostheses, in which the model base is made of a castable-refractory composition that is stable at high temperatures and is compatible with commercially available dental porcelains and gold alloys, as well as with the implaced dies and dowels. The catable-refractory composition of the invention is made by a dry blend consisting essentially of 40-50 weight percent of a refractory oxide, 6-8 percent by weight of an alkali phosphate, and 42-47 percent by weight of an alkaline-earth fluoride, and then mixing that dry blend with a colloidal silica sol of 40 weight percent content, using a ratio of 4 to 5 parts of blend to 1 part of sol. |
