Tooth primordia at early stages of mineralization in the sharks Negaprion brevirostris and Triaenodon obesus were examined electron microscopically for evidence of ameloblastic secretion and its relation to calcification of the enamel (enameloid) layer. Ameloblasts are polarized with most of the mitochondria and all of the Golgi dictyosomes localized in the infranuclear end of the cell toward t...

Enamel hypoplasia is a defect in the enamel due to disturbance of ameloblastic function during amelogenesis. The etiology of such a disturbance may be either genetic or environmental in nature. This case report of undetected congenital idiopathic hypoparathyroidism emphasizes the importance of investigating the underlying cause of these enamel defects.

Peripheral odontogenic lesions are considered to be rare within the classification of odontogenic tumors. They share the same microscopic characteristics of their central counterparts. Here, we report an ulcerated mass of the maxillary gingiva that on histopathological examination was diagnosed as peripheral developing odontoma or peripheral ameloblastic fibroodontoma. The diagnosis of this tum...