Patent ID: 6386265
Filing Date: 2002-05-14
Classification: A61C,B22D

Abstract:
A method of casting a dental prosthesis by pressure casting using an airtight chamber containing a crucible and a mold with an open top of the crucible and a mouth of a sprue runner of the mold facing each other across a rotating axis of the airtight chamber, the method comprising steps of:putting the airtight chamber at a position where the crucible with a quantity of metallic material is at a bottom and the mold is at a top; heating the crucible to melt the quantity of metallic material to produce a quantity of molten metal; and rotating the airtight chamber around the rotating axis until the airtight chamber is substantially reversed, which is characterized in that:the pressure in the airtight chamber is maintained low until a preset time point before the rotation of the airtight chamber is completed, and a pressure gas is supplied in the airtight chamber at the preset time point.