Dental Causes of postoperative sensitivity with amalgam restorations include all of the following except _____. A Lack of adequate condensation, especially lateral condensation in the proximal boxes. B Voids. C Extension onto the root surface. D Lack of dentinal sealing. 💡 Explanation Causes of postoperative sensitivity with amalgam restorations include all of the following except _____. ✓ Correct Answer: C. Extension onto the root surface.