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Fit of Porcelain Fused-to-metal Crown and Bridge Castings
G.T. Eden
Research Associate, Capt., U.S. Navy, National Naval Dental Center
O.M. Franklin
Research Associate, CPO (P), U.S. Navy, National Naval Dental Center
J.M. Powell
Research Associate, Lt. Col., U.S. Air Force
Y. Ohta
Guest Worker, Asst. Professor, Aichi Gaikuin University
George Dickson
Dental and Medical Materials Section, National Bureau of Standards, Washington, DC 20234
The dimensional accuracy of porcelain fused to metal crown and bridge castings was determined on truncated cone-shaped steel dies. Ni-Cr castings produced in manufacturers' laboratories were consistently undersize, while precious metal castings were consistently oversize. Ni-Cr castings, produced in NBS laboratories using a modified investing technique, were routinely oversize.
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Journal of Dental Research, Vol. 58, No. 12,
2360-2368 (1979)
DOI: 10.1177/00220345790580120501
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