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Fig. 4 | Journal of Translational Medicine

Fig. 4

From: PDL regeneration via cell homing in delayed replantation of avulsed teeth

Fig. 4

Histological morphology of three typical cases of the roots in Group B. a, e, g are the overall histological morphology of the roots, and b–d, f, h are magnified images of the lined rectangles in a, e, and g, respectively. a–d is a typical case of root replacement resorption. c The root surface was in direct contact with the alveolar bone, characteristic of dentoalveolar ankylosis. It seems that the tubular structure of dentine was underwent vivid degradation. In some regions of dentine, the original compact structure became loose with the appearance of a few pores. Layered pattern could be seen in the dentin structure. Some of the dentinal tubules were distorted, while some were already replaced by alveolar bone structure (b, d). e and f is a typical case of inflammatory root resorption. Intensive inflammation was observed with the presence of accumulation of numerous inflammation cells around the surface of the root. The root structure was seriously destroyed and only a small incomplete structure was left. g and h is a case which may be subjected to both replacement resorption and inflammation resorption. A few dentinal tubules debris could be identified and the whole root could not be found anymore. Formation of dentoalveolar structure was observed in some areas surrounding the dentinal debris, whereas others were lacunae structure. Bon alveolar bone, Cem cementum, Den dentin, RC root canal. Bar scales 250 μm for a–h

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