INBDE (Integrated National Board Dental Examination) Practice Exam

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Which of the following materials has the highest linear coefficient of expansion?

  1. Amalgam

  2. Direct gold

  3. Tooth structure

  4. Composite resin

The correct answer is: Composite resin

Composite resin has the highest linear coefficient of expansion among the materials listed. The linear coefficient of thermal expansion measures the change in length of a material in response to a change in temperature. Composite resins have a higher coefficient of thermal expansion compared to other restorative materials like amalgam, direct gold, and tooth structure. This property is important to consider in restorative dentistry to prevent issues such as marginal leakage, restoration failure, and tooth fracture that can occur due to the mismatch in expansion rates between materials and tooth structure.

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