Assessment of postoperative pain after root canal treatment using different rotary systems.

Randomized controlled clinical trial comparing three types of endodontic rotary files to assess their effect on postoperative pain after single visit root canal treatment of premolar teeth diagnosed with acute irreversible pulpitis.

Inclusion Criteria:

• Systematically healthy patients,
• maxillary or mandibular premolar teeth with acute irreversible pulpitis and indicated for conventional endodontic treatment.

Exclusion Criteria:

• Non-vital teeth,
• teeth with apical periodontitis,
• teeth requiring endodontic retreatment,
• root resorption,
• immature / open apex,
• root canals with radiographic evidence of calcification,
• presence of more than one symptomatic tooth in the same quadrant,
• pregnancy,
• medically compromised patients,
• patients receiving medication for chronic pain,
• patients who have taken analgesics in the last 12 hours before treatment.
• teeth that have initial apical size more than 20,
• teeth that could not be treated in a single session,
• if any evidence of extrusion of root filling material noticed radiographically, patient will be excluded.