Evaluation of the Effect of Salivary Melatonin Levels on Postoperative Pain and Sleep Quality Following Endodontic Treatments Performed at Different Days and Times

Inclusion Criteria: Patients aged 25-45 years Patients with two asymptomatic, devital mandibular molars in the same arch No radiographic evidence of periapical lesions or pathological formations in the teeth Patients without systemic diseases (ASA I) Patients who have not used antibiotics, analgesics, or melatonin-containing medications within the last week Patients who have signed the informed consent form Exclusion Criteria: Patients with a diagnosis of sleep disorder or those regularly using sleep medications/sedatives Patients with systemic diseases (e.g., hypertension, diabetes, endocrine disorders, etc.) Patients receiving psychiatric treatment Pregnant or breastfeeding patients Patients unable to cooperate during the treatment process Patients with restorative or periodontal complications in their teeth Patients working in a shift system