Currently, the most widely accepted theory is the hydro-
dynamic theory. In the nineteenth century, Gysi [27] deter-
mined that there was an outward flow of fluid along the
dentinal tubules, and proposed, without research evidence,
the hypothesis that appropriate stimuli applied to the dentin
surface increased change of fluid flow which, in turn, trig-
gered the pulpal nerves. Many years later, Brไnnstr๖m and
Currently, the most widely accepted theory is the hydro-dynamic theory. In the nineteenth century, Gysi [27] deter-mined that there was an outward flow of fluid along the dentinal tubules, and proposed, without research evidence, the hypothesis that appropriate stimuli applied to the dentin surface increased change of fluid flow which, in turn, trig-gered the pulpal nerves. Many years later, Brไnnstr๖m and
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