Studies on the castability of Co-Cr alloy for cast plates. Part 2: Effect of form of sprue attachment to the wax pattern |
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| Authors: | Y Satoh M Miyata F Ono Y Ujiie H Toyoma K Ohki N Satoh K Kimura Y Shiina K Maeda |
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| Institution: | Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan. |
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| Abstract: | Co-Cr alloy is used more frequently than Ni-Cr alloy as a non-precious alloy for cast plates in Japan. However, since the melting point of Co-Cr alloy is very high, about 1300 degrees C, and since it oxidizes easily, a vacuum-pressure casting machine capable of melting this alloy in a reducing atmosphere has recently been developed. Using this vacuum-pressure casting machine, the authors studied the effects on the castability of Co-Cr alloy due to the form of sprue attachment to the wax pattern. The results clarified that in the vacuum-pressure casting method, the form of sprue attachment to the wax pattern has a significant effect (p less than 0.01) on the castability of Co-Cr alloy. |
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