A study to comparatively evaluate the post operative pain between root canal preparation by reciprocating file (TF) and full rotation file (M-Pro) in patients with single rooted teeth with acute irreversible pulpits.

Teeth with symptomatic irreversible pulpitis are selected according to the eligibility and exclusion criteria and patients are then randomized to receive treatment after using Twisted files or M-pro files. The treatment is done in single visit. The postoperative pain is then assessed using the Numerical Rating Scale 6,12, 24 and 48 hours post-instrumentation.

Inclusion Criteria:

• Patients in good health (American Society of Anesthesiologists Class II or higher).
• Patients having symptomatic irreversible pulpitis in their single rooted teeth.
• Age range is between 20 and 60 years.
• Patients who can understand numerical rating scale (NRS).
• Patients able to sign informed consent.

Exclusion Criteria:

• Patients with positive percussion test.
• Patients having history of necrosis with or without apical pathosis.
• Patients have sinus tract or fistula extra oral or intraoral.
• Pregnant or mentally retarded patients.
• Teeth with grade 2 or 3 mobility.