Comparative histopathological studies in oral lichen planus.

A comparative histological study of 100 cases of oral lichen planus, originating from Cuba and Hungary, was carried out in order to define some characteristics, especially epithelial dysplasia and their possible relation with the clinical types. The ratio of dysplastic changes found was 11%, the presence of more than one layer of cells having a basaloid appearance being the most frequent feature, followed by loss of polarity of basal cells. In relation with the clinical types the ratio of dysplasia was higher in atrophic/erosive cases (25%).