Abstract
By combining information from X-ray transparency and from molten titanium flow, the casting process in a U-type cavity simulating crown section was investigated under several conditions, such as type of casting machine or sprue diameter.Despite the machine type, centrifugal(CT)or two-chamber pressure(PR)machine, jet flow and F type filling were observed in the occlusal area.The flow pattern in the axial area, however, was controlled by the main body force of each casting machine;it was the B type for PR and the F type for CT.Major factors related to internal defects were sprue diameter for PR and sprue-attachment position and angle for CT.
