Reactions to a number of idiopathic, pathological and pharmacological stimuli may result in overgrowth of gingiva, whose mechanisms have not been established yet. The aim of the present work was to evaluate morphometrically and stereologically the effect of phenytoin (PHT) and cyclosporine (Cs) on the gingival tissues of rats. Ten rats received daily IP injection of PHT, 2 mg/kg of body weight/day, which was increased in 2 mg at each two weeks, during 60 days. Ten rats received 10 mg/kg of body weight/day of Cs, subcutaneously, during the same period of the previous group. All rats treated with Cs developed gingival overgrowth, with increased thickness of the epithelium, height and wideness of connective tissues, as well as, increased density of fibroblasts and collagen fibers, when compared with the rats treated with PHT and with the control. These results suggest that Cs, in the used dose, is more efficient in the development of gingival overgrowth in rats. Cs-induced gingival overgrowth is a tissue with an altered composition, characterized by increasing of the density of fibroblasts and by physiologic unbalance of collagen synthesis.
Fibromatosis; Phenytoin; Cyclosporine
