# The coefficient of thermal expansion of which of the following dental materials is the highest?
A. Amalgam
B. Gold inlay
C. Silicate cement
D. Acrylic resins
The correct answer is D. Acrylic resins.
Linear coefficient of thermal expansion (α = coefficient of linear expansion (°C−1))
Tooth 9 - 11
Silicate 8
Unfilled acrylate 81
Composites 28 - 45
Amalgam 25
Direct gold 18
Aluminous porcelain 6 - 7
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