Oral lichen planus (OLP) is a chronic inflammatory mucocutaneous disease, affecting 1%-2% of the population at middle age, with a discrete female predominance (Anuradha et al., 2008;Gupta et al., 2013). OLP aetiology is unknown but evidence suggests that this disease is an immune-mediated process orchestrated by CD 4+ and CD 8+ T lymphocytes as well as by diverse inflammatory cytokines that lead to the apoptosis of epithelial cells (Kurago, 2016;Payeras et al., 2013).Reticular OLP represents the most frequent clinical presentation, characterized by interlaced striae, called Wickham's striae, and hyperkeratotic papules and plaques, usually asymptomatic

Objectives: To evaluate the serum and salivary levels of IL-1β, IL-6, IL-17A, TNFα, IL-4, and IL-10 in patients with oral lichen planus (OLP) treated with Photobiomodulation (PBM) and clobetasol propionate 0.05%.Material and Methods: Thirty-four OLP patients were randomized into two groups: Control (clobetasol propionate 0.05%) and PBM (660 nm, 100 mW, 177 J/cm 2 , 5 s, 0.5 J per point). Serum and saliva were collected at baseline and at the end of treatment (after 30 days) and evaluated using ELISA. The cytokine results were correlated with pain, clinical subtypes, and clinical scores of OLP.Results: IL-1β, IL-6, IL-17A, TNFα, and IL-4 levels were higher in saliva in relation to serum. IL-1β was the most concentrated cytokine in saliva, and a positive correlation with the severity of OLP was noticed. After treatment with corticosteroid, IL-1β in saliva decreased significantly. No modulation of all cytokines was observed after PBM. Conclusion:IL-1β appears to be an important cytokine involved in OLP pathogenesis. In addition, the mechanisms of action of PBM do not seem to be linked to the modulation of pro or anti-inflammatory cytokines at the end of treatment. It is possible that this events occurred early during treatment.

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