[Development of plasma extravasation in the dental pulp]

Recent studies suggest an active participation of postcapillary venules in inflammatory plasma extravasation. Intravital microscopic studies of rats' incisors show that Evans blue allows the demonstration of plasma extravasation in the dental pulp. This process takes place in the postcapillary venules, as can be seen from the staining of the interstice. Rather than depending on hydrodynamic pressure mechanisms, inflammatory plasma extravasation seems to be subjected to a direct regulation of vascular permeability.