Co-efficient of Thermal exansion of amalgam is______________?
Correct answer: D. 25.0 a (ppm k-1)
- A. 6.6 a (ppm k-1)
- B. 11.4 a (ppm k-1)
- C. 14.0 a (ppm k-1)
- D. 25.0 a (ppm k-1)
Explanation
Dental amalgam has a relatively high coefficient of thermal expansion, about 25 ppm/K, compared with tooth structure. This mismatch can contribute to marginal leakage during temperature changes.
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