Transmission of stimulus across dentin is______________?
Correct answer: D. Stimulus induced fluid flow
- A. Direct activation of nerve endings
- B. Correlated with the innervation density of the dentin
- C. There is no transmission of stimulus across dentin
- D. Stimulus induced fluid flow
Explanation
Dentin sensitivity is explained by the hydrodynamic theory: stimuli produce movement of fluid within dentinal tubules, which excites pulpal nerve endings. Direct nerve endings within dentin and nerve density do not adequately explain dentinal sensitivity.
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