[Hydrodynamics of dental dentinal fluid].

Background: Dentinal fluid is very close in its physical and mechanical properties and composition to blood plasma, which makes it a potentially aggressive biological environment for modern adhesive systems. An in-depth study of the physiological processes of the functioning of tooth dentin remains relevant in order to solve problems associated with its artificial restoration.

Purpose of the study: Study using computer simulation speed of movement and pressure distribution of dentinal fluid in the dentinal tubule of the tooth to assess the possibilities of their regulation.

Material and methods: To model the distribution of flow velocity and pressure of dentinal fluid in the dentinal tubule, the finite element method (Fluent ANSYS computer program) was used.

Results: Immediately behind the spherical tip of the odontoblast, there is a rapid increase in the hydraulic diameter of the flow section of the dentinal tubule, and, accordingly, a decrease in capillary pressure, while the tip of the odontoblast creates a large local hydraulic resistance. The resulting distribution of pressure drop in the damaged dentinal tubule is consistent with the fact that fluid movement is due, to a greater extent, to the capillary effect rather than the inlet pressure into the dentinal tubule.

Conclusion: By changing the length of the odontoblast process, it is possible to influence the parameters of the hydrodynamics of dentinal fluid in the space of the dentinal tubule.