HESI General Chairside Assisting Practice Exam

The thermal conductivity of dental cement should ideally be similar to which material?

1. Enamel

2. Dentin

3. Cementum

4. Amalgam

The correct answer is: Dentin

The thermal conductivity of dental cement is ideally similar to that of dentin because dentin serves as the natural insulating material in the tooth structure. This property is essential for protecting the pulp from thermal stimuli such as hot or cold foods and beverages. By having a thermal conductivity that closely matches that of dentin, dental cements can effectively insulate the underlying pulp tissue, minimizing any discomfort or sensitivity that may arise from temperature changes. This mimicry of dentin helps maintain the overall health and comfort of the tooth, ensuring that the dental restoration does not introduce any adverse thermal effects. In contrast, enamel has a different thermal conductivity, and while cementum is also important, it is not the primary layer providing insulation. Amalgam, while a restorative material, has higher thermal conductivity than dentin, which could result in more significant thermal transfer to the pulp if used inappropriately without an insulating layer like dentin or suitable dental cement. Therefore, similarity to dentin in thermal conductivity is critical in promoting patient comfort following dental procedures.