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The method of the cytotoxicity assay (1 = biopsy of normal human gingival tissue, 2 = isolation of fibroblast cells, 3 = cultivation of fibroblast cells, I = different dentin adhesives, II = adhesives were applied centrally to the sterile bases of glass slides, III = eluate was obtained, 4 = eluate added to fibroblasts in Petri dishes).
