Comparing the postoperative pain resulting after mechanical instrumentation using Reciproc reciprocating files versus that resulting after using ProTaper Next rotary files in asymptomatic necrotic molars.

Asymptomatic Necrotic molars are selected according to the eligibility and exclusion criteria and patients are then randomized to receive treatment either using Reciproc Files or ProTaper Next files. Postoperative pain is then assessed using the Numerical Rating scale 6, 12, 24 and 48 hours post-instrumentation. The tooth is then temporized and after 1 week obturation is then and post obturation pain is assessed using the Numerical Rating scale after 12 and 24 hours following obturation. The time required to complete instrumentation is also measured and compared using the two files.

Inclusion Criteria:

• Mandibular molar teeth with no pain, no response of pulp tissue to pulp testing and teeth with apical periodontitis

Exclusion Criteria:

• Patients on medication for chronic pain
• Patients with pre-operative pain.
• Patients having significant systemic disorders.
• Patients with two or more adjacent teeth requiring root canal therapy
• teeth that have vital pulp tissues, greater than grade I mobility, pocket depth greater than 5 mm, no possible restorability or previous endodontic treatment.