Thermal shear stresses that arise from a mismatch of expansion coefficients (Δα) between porcelain and gold alloy can exceed the 13,000 psi shear resistance of the bond. Therefore, calculations of the Aa tolerance were made. A Aa of 0.125 X 10 -6 inch/inch/degrees F is safe.
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Nielsen et al. (1972) studied this question.
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