Evaluation of the degree of influence of intrapulpal pressure on the hydrodynamic parameters of the movement of dentinal fluid of the tooth

Objective. To study the influence of intrapulpal pressure on the parameters of dentinal fluid hydrodynamics in the dentinal tubule of the tooth using computer modeling. Materials and methods. The finite element method (Fluent ANSYS computer program) was used to model the distribution of flow velocity and pressure of dentinal fluid in the dentinal tubule. Results. The shorter the open dentinal tubule, the higher the rate of dentinal fluid flow in it and the more of it comes out to the surface of mechanically and chemically treated dentin of the tooth. The rate of movement and volume of dentinal fluid passing per unit of time through the dentinal tubule are determined mainly by the capillary pressure, which in it reaches 2.17∙105 Pa, which is more than 2 orders of magnitude greater than the pressure at its entrance. Artificial reduction of the length of the odontoblast process in the dentinal tubule can create conditions for a significant decrease in the volume of dentinal fluid coming out of it and thus reduce its negative impact on the quality of adhesion of the composite material. Conclusions. Changes in intrapulpal pressure do not play a decisive role in changing the parameters of dentinal fluid hydrodynamics, but it can be argued that its reduction allows to somewhat slow down its exit to the surface of the treated dentin and thus, positively influence the processes associated with the quality of restoration of hard dental tissues with composite materials.