The evaluation of salivary oxidative stress in patients with familial Mediterranean fever and chronic periodontitis

Background Familial Mediterranean fever (FMF) is an inherent autoinflammatory disease and have a high prevalence in Mediterranean countries. The aim of this study was to evaluate salivary levels of oxidative stress parameters in patients with FMF and chronic periodontitis. Methods The study population consists of 81 patients with FMF and 85 systemically healthy controls. The test and control groups were classified as chronic periodontitis and periodontally healthy [FMF‐periodontitis (n = 37); FMF‐periodontally healthy (n = 44); systemically healthy‐periodontitis (n = 37); systemically and periodontally healthy (n = 48]. Total salivary samples were collected. Clinical periodontal parameters including plaque index, gingival index (GI), probing depth (PD), the percentage of bleeding on probing (BOP%), and clinical attachment level (CAL), were measured. Salivary total antioxidant status (TAS), total oxidant status (TOS), 8‐hydroxydeoxyguanosine (8‐OHdG), malondialdehyde (MDA), and oxidative stress index (OSI) were evaluated. Results The FMF‐periodontitis group had significantly higher levels of 8‐OHdG, MDA, and OSI than that of the FMF‐periodontally healthy group. In the FMF‐periodontitis group, PD, 8‐OHdG, MDA, and OSI levels were significantly higher than in the systemically healthy‐periodontitis group (P = 0.035, P = 0.000, P = 0.000, and P = 0.000, respectively). 8‐OHdG values were significantly correlated with BOP% and GI, and TOS values were significantly correlated with PD and CAL in the FMF‐periodontitis group. Conclusions In the presence of FMF and chronic periodontitis, there were increased salivary levels of oxidative stress. Thus, oxidative stress could be an important inflammatory mechanism in the FMF and chronic periodontitis. Further studies need to clarify the oxidative mechanisms of FMF and chronic periodontitis.