CAT and periodontal disorder: 50 type 2 diabetic patients with periodontal disease were split into two groups. The test group received 250 mg/day of melatonin (2 tablets), and the control group received a placebo. All patients underwent scaling and root planning at the study's start. Serum levels of interleukin-1b, malondialdehyde, total antioxidant capacity, superoxide dismutase, catalase, and glutathione peroxidase were measured before and after the intervention