<prompt> Causes of postoperative sensitivity with amalgam restorations include all of the following except ___.Lack of adequate condensation, especially lateral condensation in the proximal boxes.Voids.Extension onto the root surface.Lack of dentinal sealing.  <response>: The primary causes of postoperative sensitivity for amalgam restorations are voids especially at the margins, poor condensation that may result in a void, or inadequate dentinal sealing. Extension onto the root surface does not necessarily result in increased sensitivity. 