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Abstract
Objective: This study compared the postoperative pain after the use of manual and rotary instrumentation of the same instrument design, namely ProTaper Universal system (Dentsply Maillefer ,Tulsa Dental, TN, USA) in mandibular posterior teeth after single root canal treatment, in a randomized clinical trial. Participants and Methods: Forty-six participants with vital or non-vital, mandibular posterior teeth without periapical pathosis, were endodontically treated in single visit. The patients were equally allocated at random into two groups. The instrumentation was done according to manufacturer instructions using either manual ProTaper files for (group M) or rotary ProTaper files for (group R). Irrigation was done using 2.6% NaOCl and 17% EDTA, canals were obturated using gutta-percha and resin sealer by active lateral compaction technique. Pain scoring was done using Numerical Rating Scale (NRS) preoperatively then after 6 hours, 12 hours, 24 hours, 48 hours, 72 hours and 7 days postoperatively. Pain levels were assigned to one of four categories, None, Mild, Moderate or Severe.Statistical analysis was done by Statistical Package for Social Sciences (SPSS) vs. 21, P-values < 0.05 were considered significantsults in a lower incidence and a shorter duration of postoperative pain than manual instrumentation