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Principles Of Tooth Preparation Practice Test

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Which statement best explains why post-operative sensitivity increases as more tooth structure is reduced during crown preparation?
Correct Answer:
All enamel is removed and many dentinal tubules are exposed; tubules connect to pulp, increasing sensitivity.
Explanation:
When tooth structure is removed during crown preparation, enamel is stripped away and dentin becomes exposed. Dentin contains numerous tubules that connect directly to the pulp. Stimuli such as heat, cold, or osmotic changes cause fluid movement inside these tubules. This movement irritates the nerve endings in the pulp, producing pain or sensitivity. The more dentin and tubules that are exposed, the greater the potential for fluid movement and sensitivity, which is why sensitivity tends to increase as more tooth structure is reduced. The other ideas don’t fit because the pulp doesn’t gain tissue from preparation, tubules don’t close to reduce sensitivity, and merely achieving a perfect margin doesn’t explain postoperative sensitivity.

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