INBDE (Integrated National Board Dental Examination) Practice Exam

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How are materials ranked based on their coefficient of thermal expansion?

Composite > Amalgam > Gold > Tooth > Porcelain
Amalgam > Composite > Gold > Porcelain > Tooth
Gold > Composite > Amalgam > Tooth > Porcelain
Tooth > Porcelain > Gold > Amalgam > Composite

The correct answer is: Composite > Amalgam > Gold > Tooth > Porcelain

The coefficient of thermal expansion measures how much a material expands or contracts when exposed to changes in temperature. When ranking materials, the highest coefficient of thermal expansion will be the most expandable material. In this case, composite, being the highest on the list, has the highest coefficient of thermal expansion. Technically, all options have some degree of thermal expansion, but the items at the beginning of the list have a larger degree of expansion compared to those at the end. Therefore, option A is the most accurate ranking of materials based on their coefficient of thermal expansion.