The wax patterns are placed in a special plaster called investment and heated to a high temperature which vaporizes the wax. The space occupied by the wax is then filled with molten metal. This procedure is called the "lost wax" casting technique and yields an exact replica of the wax pattern in the metal desired.
Degassed castings awaiting porcelain application.
The castings are cleaned and heated to 1900 degrees to remove any impurities in the metal prior to applying porcelain. This procedure is known as degassing.
Opaque layer of porcelain being added to the metal casting.
Placing porcelain on a casting to make a lifelike looking crown is a painstaking process that requires putting layering of porcelains of different color and translucency by hand. The first layer is called the "opaque" and masks the color of the underlying metal. The porcelains are applied as pastes and shaped while they dry to simulate a tooth. The casting is usually "fired" (heated to 1750 degrees) between layers of application.
Same casting as above after firing.
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