Immunofluorescent studies in desquamative gingivitis.

Twenty-seven patients (19 females and 8 males) with a clinically diagnosed desquamative gingivitis were used in this study. Twenty-seven additional patients with oral and skin diseases and with gingival involvement other than that of the desquamative gingivitis type served as controls. Biopsy gingival specimens were sectioned and stained with H and E. The rest of the tissue specimen was cut with a cryostat and used for immunofluorescent assays of the tissue-bound antibodies (IgG, IgA, IgM, C3 anf fibrin). Circulating antibodies were determined by using the indirect immunofluorescence method in serum samples. Normal human oral mucosa and several animal epithelial tissues were used as substrates. The immunopathologic findings suggest the diagnosis of lichen planus in the presence of linear or granular fibrin deposition at the basement membrane zone/mucosal submucosal interface with or without cytoid bodies and cicatricial pemphigoid, in the presence of circulating and/or tissue-bound immunoglobulins and C3 in a linear continuous pattern along the BMZ. It is suggested that an accurate diagnosis of the underlying disease of the desquamative gingivitis can be made on the bases of the clinical, histopathologic, immunopathologic and follow-up findings.