Fluid flow in or out of the dentinal tubules is proportional to the tubule diameter by
Third power of the diameter
Sixth power of the diameter
Square of diameter
Fourth power of diameter
fluid flow in dentin tubules follows Poiseuille’s law as all tubular structures:
Q=Pr4/8nl
Q= blood flow
P= pressure difference
N= velocity
R= radius of vessel
L= length of vessel