Sanitation of the oral cavity was initiated with periodontal scaling, root planning, and the removal of the bridge. Regarding the blood test results, all the hemogram parameters were found to be within the normal range. Thyroid blood tests revealed a hypothyroidism FT4: 23,88 pmol/L (10-22) and TSH<0,05 µL/ml (0.27-4,2), and an HCV serology using ELFA (Enzyme-Linked Fluorescent Assay) was positive.
An incisional biopsy of the lesion was performed under local anesthesia (Medicaine 2% with adrenaline 1/100.000®, Medis, Tunisia) from the left buccal mucosa. The specimen was divided into two parts, the first was kept in 10% formalin and submitted to the anatomopathological examination and the second was immediately placed in saline solution and immediately transported for direct immunofluorescence analysis.
The anatomopathological results revealed a band-like infiltrate made up of lymphocytes and plasma cells associated with liquefaction degeneration of the basal cell layer confirming the diagnosis of erosive OLP (Figure 3).