For porcelain fused to metal crown, the porcelain should have ______________?

Correct answer: C. Linear coefficient of thermal expansion less than that of metal

A. High fusion expansion
B. High fusion temperature
C. Linear coefficient of thermal expansion less than that of metal
D. Linear coefficient of thermal expansion more than that of metal

Explanation

Porcelain should have a slightly lower linear coefficient of thermal expansion than the metal, so cooling places the porcelain in desirable compression. A porcelain expansion greater than the metal would create tensile stress and encourage fracture.

Submitted by a TestUstad contributor and published by the TestUstad editorial teamLast updated 18 September 2026

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