INBDE (Integrated National Board Dental Examination) Practice Exam

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What has the highest coefficient of thermal expansion?

  1. Composite

  2. Gold

  3. Porcelain

  4. Sodium Chloride

The correct answer is: Composite

Composite has the highest coefficient of thermal expansion among the given options. This means that composite material expands the most when heated and contracts the most when cooled compared to gold, porcelain, and sodium chloride. Gold, porcelain, and sodium chloride have lower coefficients of thermal expansion, and therefore do not expand or contract as much when heated or cooled.

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