Because the thermal expansion of a restorative material usually does not match that of the tooth structure, a differential expansion or contraction occurs that may result in leakage of oral fluids between the restoration and tooth.

Question

Quizplus · Accepted Answer

The first statement is correct because different materials indeed have different coefficients of thermal expansion, which can lead to mismatches between restorative materials and tooth structures. The second statement is also correct as this mismatch can cause gaps to form between the restoration and the tooth, potentially leading to leakage of oral fluids into these spaces.

Because the Thermal Expansion of a Restorative Material Usually Does