What could excessive expansion of a restorative material result in?

Name: What could excessive expansion of a restorative material result in?
Brand: Quizplus
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Excessive expansion of a restorative material may result in fracture of cusps.Excessive contraction may result in leakage of fluid and bacteria into the open gaps,resulting in sensitivity.Expansion and contraction are measured using the coefficient of thermal expansion,the measurement of change in volume or length in relationship to change in temperature.

What Could Excessive Expansion of a Restorative Material Result In