Our simulations reveal that the odontoblastic process displacement accounts for the difference in the response of intradental nociceptors to inward and outward flows.
The results of Fig. 2 indicate that the distinct difference in intradental neural responses to different fluid flow directions may be attributed to odontoblastic process displacement.
The local channel diameter (distance between terminal bead and odontoblastic process) depends upon the odontoblastic process displacement, which, in turn, depends upon the velocity and direction of the fluid flow.
This assumption is deemed adequate for illustrating the overall behavior of the odontoblastic process in response to the dentinal fluid flow, because a higher rate of fluid flow will lead to a larger odontoblastic process displacement [4].
To model the effect of odontoblastic process movement upon the shear stress on the terminal bead, it was assumed here that the odontoblastic process displacement in the fluid flow direction changes linearly with the flow velocity.
For example, when an inward flow is applied, a higher rate of fluid flow will cause more significant odontoblastic process displacement, increasing thereby the dimension of the channel available for the fluid flow [18] (Fig. 1 D).
Conversely, the odontoblastic process displacement in the inward flow case tends to increase the dimension of the space for the fluid flow around the terminal bead wall (Fig. 1 D), resulting in a lower τMSS even though the fluid velocity at the boundary is relatively high.
This is a relatively slow process; displacement of vEGTDEL will typically take multiple passages.
It is necessary to conduct theoretical simulations in order to determine the characteristics of the short-wavelength irregularities based on the AK track recording car's raw acceleration and processed displacement data [9].
