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Thermal stimuli in dentinal sensitivity.

Current thinking on thermal stimuli and dentinal sensitivity are reviewed in this manuscript. There are two schools of thought: 1) following the Hydrodynamic Theory, thermal stimuli evoke dentinal sensitivity by changing physical properties of the dentin, namely, tubular radius and dentinal fluid viscosity, and 2) thermal stimuli evoke dentinal stimuli by altering physiological properties of the pulp, namely, pulpal microcirculation, which in turn causes excitation of pulpal sensory nerves by an increased tissue pressure.