Coefficient of thermal expansion of metal-ceramic alloys is________________?
Correct answer: D. More than or equal to porcelain but not less
- A. Same as porcelain
- B. More than porcelain
- C. Less than porcelain
- D. More than or equal to porcelain but not less
Explanation
For a metal-ceramic restoration, the alloy’s thermal expansion should be slightly greater than, or at least equal to, that of porcelain so cooling leaves the porcelain in compression. A lower alloy expansion would place the porcelain under tensile stress and increase cracking risk.
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