SOD1 and oral lichen planus: Therefore, the aim of the present study was twofold: (i) to compare the effects of photodynamic therapy and topical corticosteroid therapy on the activity of selected salivary antioxidants (SOD, CAT, Px, GSH) in patients with OLP in a randomized clinical trial setting, and (ii) to assess the correlations between salivary antioxidant activity and changes in lesion size and pain intensity (VAS) according to the applied treatment modality.