What is characterized by the movement of fluid in dentinal tubules during tooth sensitivity?

The movement of fluid in dentinal tubules during tooth sensitivity is best characterized by hydrodynamic theory. This theory posits that changes in temperature or pressure can cause fluid movement within the microscopic tubules of the dentin, leading to stimulation of the nerves located in the pulp. When a stimulus, such as hot or cold, is applied to the tooth, it alters the flow of this fluid, resulting in an increased sensation that can be interpreted as tooth sensitivity or pain.

This mechanism effectively explains why individuals experience discomfort when exposed to certain stimuli. The hydrodynamic theory identifies the fluid dynamics within the dentinal tubules as a central factor in the sensitivity experienced by patients, making it a fundamental concept in understanding dental pain mechanisms. Other theories do not specifically address the role of fluid movement, hence they do not encapsulate the phenomenon of dentinal sensitivity as accurately as hydrodynamic theory does.