Evaluation of serum prolidase activity and oxidative stress in patients with temporomandibular joint internal derangement.

Objective: To investigate serum prolidase activity and oxidative stress in patients with temporomandibular joint internal derangement (TMJ-ID).Methods: Seventy patients with Wilkes stage III, IV, and V joints and 70 healthy controls were included. Serum prolidase activity and oxidative stress parameters, including total antioxidant status (TAS), total oxidant status (TOS), oxidative stress index (OSI), advanced oxidation protein products (AOPP), glutathione (GSH), ferric reducing antioxidant power (FRAP), and lipid hydroperoxide (LOOH) were measured.Results: The levels of prolidase, TOS, OSI, AOPP, and LOOH were significantly higher in the TMJ-ID group than in the control (p = .0001). TAS and FRAP level was significantly lower in the TMJ-ID group than in the control (p = .0001). There was no significant difference in GSH between groups.Conclusion: Significantly increased prolidase activity and oxidative stress in patients with TMJ-ID may be related to long-term collagen tissue damage, and inflammation and can be effective in the etiology of TMJ-ID.