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

This statement is true as most restorative materials have a different coefficient of thermal expansion compared to the tooth structure which causes differential expansion or contraction resulting in leakage of oral fluids between the restoration and tooth.

Because the Thermal Expansion of a Restorative Material Usually Does