Figure 3. Metabolic activity and cell density were measured by XTT assay (A) and CVDE test (B) performed with gingival fibroblasts from the young (black) and older (white) donors, against the denture adhesives Fixodent, Corega Ultra or Corega powder. Bars indicate mean±SD of two independent assays in quintuplicates, reported as the optical densities measured at 480 (O.D.480) or 540 nm (O.D.540). Cells exposed to culture medium were used as blank, polystyrene beads (PS) as a negative control and latex extracts as a positive control. *Significantly different from all other groups (P<0.05).
