For porcelain fused to metal crown, the porcelain should have ______________?
Correct answer: B. Linear coefficient of thermal expansion less than that of metal
- A. High fusion expansion
- B. Linear coefficient of thermal expansion less than that of metal
- C. High fusion temperature
- 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.
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