To Measure Post Operative Pain Severity by Using Two Different Intra Canal Medicaments Calcium Hydroxide and Triple Antibiotic Paste in Teeth with Single Roots and Periapical Disease Called Apical Periodontitis

Inclusion Criteria: * Patients of both genders having age 12-45 years * Newly diagnosed cases fulfilling the criteria of INTERNATIONAL ASSOCIATES FOR THE STUDY OF PAIN definition of pain. * A Single rooted teeth (Anterior or Posterior) * Teeth with symptomatic apical periodontitis * Teeth with necrotic pulp that gave a negative response to vitality testing. Exclusion Criteria: * Patients who have allergies, sensitivity or unable to take medications, periodontal disease, acute endodontic or periodontal abscess, requiring prophylactic antibiotics, systemic diseases like hypertension, diabetes, liver dysfunction renal failure and mental disabilities were excluded. * Pregnant ladies or patients on nursing were also excluded from the sample. * Teeth with anatomical difficulties such as open apices. * Teeth with severe dilacerations, calcified canals, occlusal interferences, chronic periodontitis, internal/external root resorption. * Patients with serious medical illness, systemic disorders, immunocompromised diseases such as AIDS or HBV.