Studies on the castability of Co-Cr alloy for cast plates. Part 2: Effect of form of sprue attachment to the wax pattern.
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.
Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan.
Y
Y
Satoh
M
M
Miyata
F
F
Ono
Y
Y
Ujiie
H
H
Toyoma
K
K
Ohki
N
N
Satoh
K
K
Kimura
Y
Y
Shiina
K
K
Maeda
D002858:Chromium Alloys; D003735:Dental Casting Technique / Q000295:instrumentation*; D003819:Denture Bases; D004867:Equipment Design; D007283:Inlay Casting Wax; D003765:Models, Dental; D014618:Vacuum
D002858:Chromium Alloys; D007283:Inlay Casting Wax