Abstract
Porcelain-fused-to-metal crowns though having a better aesthetic appearance, are admittedly inferior in strength, as compared with full cast crowns. We have used the X-ray stress measurement method that is the means of a non-destructive measurement, and this method is used to assess the residual stresses of various metals. X-ray diffraction examinations were made to evaluate the possibility of X-ray stress measurement of precious metals. Precious metal strips were then prepared to determine the change in the stress value during the porcelain firing process. The high compression stress produced by polishing was reduced by degassing. X-ray stress measurement of precious metals were successfully obtained.
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