[Histological study of the remains of periodontal membrane at the alveolar wall after tooth extraction].

Histological study of 40 alveolar wounds of altogether 5 dogs have given evidence to the fact that remains of the periodontal membrane could remain in the apical area of the alveoli in their whole width. In the middle part of the alveoli, remains of it are found in a thin layer. In the marginal area, bone can be found lying open with torn remnants, which are lying free in the coagulum. In these adhering rests of the periodontal membrane plenty of dynamic cells as well as dilated vessels can be observed. All these facts lead to the idea of considering the part that the remains of the periodontal membrane may possibly play in the beginning process of alveolar wound healing.