Superoxide Dismutase Activity in Synovial Fluids in Patients With Temporomandibular Joint Internal Derangement

PurposeTo measure the activity of superoxide dismutase (SOD) in the synovial fluid of patients with temporomandibular joint internal derangement and to show the relationship between the activity of SOD and the severity of the disease.Materials and MethodsTwenty patients with internal derangement were classified according to Wilkes by clinical radiological examinations. SOD activity was measured by the method based on nitrobluetetrazolium reduction rate.ResultsThe activity of SOD seemed to be progressively decreased as the stage of the disease increased.ConclusionThe reduction of SOD activity observed may result from insufficient scavenging capacity of free radicals. Further investigation and longitudinal studies are required to determine the role of antioxidants that scavenge the free radicals in temporomandibular joint disorders.