Method of and apparatus for casting dental prosthesis

An apparatus for casting a dental prosthesis by pressure casting, comprising:

• 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;
• a heater for heating the crucible;
• a rotating mechanism for rotating the airtight chamber around the rotating axis;
• a position sensor for detecting a preset angular position of the airtight chamber between a normal position where the crucible is at a bottom and the mold is at a top and a reversed position where the mold is at the bottom and the crucible is at the top;
• a delay time storing means for storing an externally given delay time;
• and
• a pressure controller for maintaining a low pressure in the airtight chamber until a second time point which is the delay time after a first time point when the position sensor detects the preset angular position of the airtight chamber and for supplying a pressure gas in the airtight chamber at the second time point.