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The hydrodynamic theory is one of three main theories in dentistry that explains dentinal hypersensitivity and tooth pain. . The theory was developed by M.Brännström in the 1960s through a series of experimental studies. It states that stimuli acting on exposed dentin causes rapid fluid flow through the dentinal tubules, stimulating the pulp nerves and causing pain. Hydrodynamic theory is currently the accepted theory for dentine hypersensitivity and is the basis for several management and diagnostic strategies applied by dental specialists.

Practicing citations
In 1900, Gysi introduced the concept of stimuli causing fluid movement in dentinal tubules. Through a series of experimental studies in the 1960s, Brännström provided evidence to first support this notion, then further develop the hydrodynamic theory to explain dentinal hypersensitivity.

With increases in modern technology e.g. scanning electron microscopes, researchers have conducted more specialised studies to support and expand Brännström’s hydrodynamic theory.

The two main alternatives are the theories of “dentine innervation”, which has been disproved by previous experiments and “odontoblast receptor”.