A Histological Study of the Exfoliation of Human Deciduous Teeth

Abstract

For clarification of the histological details of the shedding of human deciduous teeth, exfoliated and extracted deciduous teeth were examined by light and electron microscopy. After the roots were completely resorbed, the dentogingival junction migrated along the inner resorbing surface and finally reached the pulpal surface of the crown. At the same time, the gingival epithelium also proliferated and migrated under the crown of the deciduous tooth in such a way that part of it lined the residue of the pulp and another part lined the surface overlying the erupting successional tooth. This phenomenon took place from various sides of the tooth surface. Therefore, just before exfoliation, the migrated gingival epithelium formed narrow necks of tissue, and the crown was only superficially attached to the gingiva by them. The final shedding of the tooth appeared to occur by a tearing of these narrow tissue regions. The results of the present study suggest that the dento-gingival junction as well as gingival epithelium play important roles in the process of exfoliation of human deciduous teeth.

Effect of bisphosphonates sodium alendronate on shedding of deciduous molars in rabbits (histological and histochemical study)

“…Moreover, Sahara et al [33] studied the exfoliation of human deciduous teeth suggested that the internal surface of the resorbed dentin in the pulp chamber is usually repaired by deposition of cementum-like tissue.…”

In Vitro Characterization of Stem Cells from Human Exfoliated Deciduous Teeth (SHED)

“…We used deciduous incisors not molars because during shedding of molars the gingival tissue tends to migrate within the pulp chambers more pronouncedly making the extracted pulpal tissue less pure [17]. It was very interesting to find that only pulps from the upper not the lower incisors yielded successful cultures, we think that this could be attributed to the fact that the remaining pulp tissue in the upper incisors is larger.…”

Reabsorção dentária fisiológica: estudo dos mecanismos (apoptose) e das moléculas desencadeadoras (Bmp-4 e gelatinase B) em dentes decíduos de gatos.

“…Ainda degrada pontos específicos do colágeno IV, colágenos tipos III, V, VII, XI e elastina. A reabsorção dentária fisiológica caracteriza-se como um processo programado, alternando períodos de reabsorção com períodos de repouso, configurando um caráter intermitente 20,51,67,68 . Na rizólise decídua, observa-se reabsorção dentária externa e interna como padrão de normalidade, sendo evidenciado em dentes decíduos de humanos, cães e felinos.…”

“…Na rizólise decídua, observa-se reabsorção dentária externa e interna como padrão de normalidade, sendo evidenciado em dentes decíduos de humanos, cães e felinos. Nas fases ativas de reabsorção dentária são observadas nas superfícies radiculares, lacunas de Howship preenchidas por clastos, enquanto nas etapas de repouso observa-se formação de tecido de reparo de aspecto cementóide, podendo restabelecer as inserções periodontais 24,51,65,67,68 .…”

“…A quantidade de tecido cementóide aposto no processo reparador encontra-se sempre inferior ao tecido reabsorvido, com o tempo as raízes tornam-se cada vez mais curtas até a coroa ficar presa à borda gengival 20,67,68 . Nesta fase, o epitélio gengival prolifera e migra por debaixo da coroa do dente decíduo, recobrindo parcialmente o remanescente pulpar e posteriormente, sobrepondo-o totalmente.…”