INBDE (Integrated National Board Dental Examination) Practice Exam

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What has the best coefficient of thermal expansion for certain applications?

Composite
Gold
Porcelain
Sodium Chloride

The correct answer is: Gold

Gold has the best coefficient of thermal expansion for certain applications because it closely matches that of natural tooth structure. This characteristic is important in dental applications to minimize the risk of restoration failure due to mismatch in thermal expansion between the restoration material and the tooth. While composites, porcelain, and sodium chloride are also used in dental restorations, they do not have as favorable a coefficient of thermal expansion as gold does.