[Ultrastructure of the mouth mucosa in various types of oral leukoplakia].

12 cases of laukoplakia of the oral cavity was studied by electron microscopy. A correlation between the clinical type, histological- and ultrastructure of the leukoplakia was revealed. In types of leukoplakia simplex and verrucosa, where histologically cornification was found, by electron microscopy signs of keratinization (tonifibrils, granules of keratohyalin) were to be observed. In leukoplakias clinically showing erosions, histologically dysplasia, ultrastructural changes were alike those, seen in some carcinomas.