Examination of Blood Capillaries in Rat Incisor Pulp by TEM of Thin Sections and Freeze-Fracture Replicas

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Abstract
The blood vessels in rat incisor pulp were studied by transmission electron microscopy (TEM) of thin sections and examination of freeze-fracture replicas. In thin sections, two types of blood capillaries were seen in the pulp: continuous capillaries, chiefly in the basal portion, and fenestrated capillaries, found only in the incisal portion. The former may change to the latter in the middle portion of the incisors where odontoblasts are young and mineralization of dentin is progressing. This distribution of capillaries seemed to be related to the function of the pulp, i.e., the mineralization of dentin. In freeze-fracture replicas, en face views were obtained of occluding junctions between adjacent endothelial cells of continuous capillaries in the rat incisor pulp. The tight junctions were macala occludens, not perfect zonula occludens. The fenestrated capillaries of the dental pulp differed from those of the intestine in their distribution pattern and density of fenestrae.

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