[The morphological changes in the periodontal tissues of outbred white rats during ontogeny].

Morphologic studies, carried out by three methods, by van Gieson's, Schmorl's methods, and with the use of 0.1% solution of safranin T, have revealed heretofore unknown structures lying beyond the tooth rudiment of white noninbred rats and disappearing in the course of ontogenesis. The mechanism of the formation of autonomic circulation of the dental follicle, unrelated to the animal body, has been shown. Dental follicular tissues were found grown together with the gingival epithelium and they ruptured during tooth eruption.