Linear coefficient of thermal expansion of amalgam is:
**Core Concept**
The linear coefficient of thermal expansion is a measure of how much a material expands or contracts with changes in temperature. In the context of dental amalgam, it is crucial to understand this property to predict how the material will behave in different oral environments.
**Why the Correct Answer is Right**
The linear coefficient of thermal expansion of amalgam is approximately 14 x 10^-6 per degree Celsius. This value is relatively low compared to other dental materials, which makes amalgam a suitable choice for restoring teeth. The low coefficient of thermal expansion allows amalgam to expand and contract with the tooth structure, reducing the likelihood of cracking or debonding. This property is essential for the long-term success of amalgam restorations.
**Why Each Wrong Option is Incorrect**
**Option A:** This value is too low and would not accurately represent the thermal expansion of amalgam.
**Option B:** This value is higher than the actual coefficient of thermal expansion of amalgam, which would result in excessive expansion and contraction.
**Clinical Pearl / High-Yield Fact**
The coefficient of thermal expansion of dental materials should be matched as closely as possible to that of tooth structure to ensure optimal performance and longevity of the restoration.
**Correct Answer: D. 14 x 10^-6 per degree Celsius.**