Effect of Different Irrigation Activating Techniques on Irrigant Penetration Depth and on Post-Operative Pain

Inclusion Criteria: * Asymptomatic vital/non vital teeth requiring root canal treatment. * Teeth with sound periodontal apparatus. * Teeth without pus or inflammatory exudates draining through the canal. * Teeth without anatomic variations. * Teeth with sinus tract. * Teeth without history of trauma. * Patients not on analgesics or sedative medication prior to root canal therapy Exclusion Criteria: * • Patients with any systemic diseases. * Pregnant or lactating patients. * Immunocompromised patients. * Apparently thin roots in which apical preparation with #40 file would be overzealous. * Patient allergic to anything used in this procedure especially rubber dam material and Iohexol (radiographic contrast media). * Teeth with calcified canals. * Patients with acute apical periodontitis, acute apical abscess, and weeping canals. * Necrotic painful teeth with the absence of sinus tract for drainage.