The ultrastructure of the small blood vessels underlying the sulcular and junctional epithelium

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The ultrastructure of small blood vessels underlying the sulcular and junctional epithelium of clinically healthy labial gingiva in dogs has been studied with TEM and SEM. Parts of some specimens observed once with SEM were embedded in paraffin, trimmed up to the proper section, after deparaffinization and observed once more.<BR>Fenestrated types in small blood vessels underlying the sulcular and junctional epithelium were observed many times, especially near the gingival crest. About 29% of total blood vessels we observed over the entire surface of the epithelium was found to be fenestrated and these findings are similar to those reported by Mohamed (1973) who used TEM only in rabbit gingival vessels. But in our present method using SEM at the same time, it is worthy noticing that fenestrated types appeared as much as about 40%. In small blood vessels right under the epithelium, fenestrae were usually seen facing the epithelium on the opposite sides of the nuclei, but it was not always so in a deeper layer. Basement membranes of these blood vessels were indistinct oftener than those of oral epithelium.<BR>As mentioned above, fenestrated types were found many times (-40%) and at the same time basement membranes were also lacking or discontinuous, which were considered to be of help for its specific function of fluid flow in this region.
歯科基礎医学会の論文