Journal of Dental Research, Vol 62, 956-959, Copyright © 1983 by International & American Associations for Dental Research Online Journals
Dentin permeability: effects of temperature on hydraulic conductance
D. H. Pashley, S. M. Thompson and F. P. Stewart
The rates of fluid movement across dentin discs, in vitro, were measured at
10, 20, 30, 40, and 50 degrees C in unetched and acid-etched dentin.
Increasing the temperature 40 degrees (i.e., from 10 to 50 degrees C)
resulted in a 1.8-fold increase in fluid flow in unetched dentin, which was
of a magnitude similar to the decrease in viscosity that occurred over the
same temperature range. In acid-etched dentin, the 40 degrees C temperature
change produced more than a four-fold increase in fluid conductance, more
than double that which could be accounted for by changes in viscosity.
Analysis of the data suggests that this additional increment in hydraulic
conductance is due to thermal expansion-induced increases in tubular
diameter.
