Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?
Correct answer: B. 13.5-14.5 x 10^-6/°C
- A. 11.5-12.5 x 10^-6/°C
- B. 13.5-14.5 x 10^-6/°C
- C. 10.5-11.5 x 10^-6/°C
- D. 16.5-17.5 x 10^-6/°C
Explanation
Metal substructures for metal-ceramic restorations commonly have a coefficient of thermal expansion around 13.5 to 14.5 × 10^-6/°C, compatible with the veneering porcelain. Excessive mismatch can create harmful residual stresses and porcelain fracture.
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