Samar A. Mosaad, Suzan A.W. Amin And Heba A. Alasfory ,

ABSTRACT
Objective: This Randomized, Clinical Trial 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-visit Root Canal Treatment. Participants And Methods: Forty-six Participants With Mandibular Posterior Teeth Without Periapical Pathosis Were Included. The Patients Were Equally Allocated At Random Into Two Groups According To Instrumentation Technique Using Either Manual ProTaper Instruments (Group M) Or Rotary ProTaper Instruments (Group R). Root Canal Treatment For All Participants Was Done In A Single-visit. Pain Intensity Was Assessed Using The Numerical Rating Scale (NRS) 6 Hours, 12 Hours, 24 Hours, 48 Hours, 72 Hours And 7 Days Postoperatively. Pain Incidence At Four Categories (None, Mild, Moderate Or Severe) Was, Also, Recorded. Data Were Statistically Analyzed And P-values< 0.05 Were Considered Statistically Significant.

Results: There Were Significantly More Patients Experiencing No Pain In Group R Than Group M At 12 And 24 Hours (p< 0.05). No Significant Difference In The Distribution Of Patients At The Different Pain Categories Was Detected For The Other Time Points (p>0.005). Patients In Group R Showed Significantly Less Pain Levels Than Those In Group M At 6, 12 And 24h Postoperatively (p< 0.05). Conclusion: Rotary Instrumentation Can Elicit Less Postoperative Pain Than Manual Instrumentation In Patients With Mandibular Posterior Teeth Endodontically Treated In A One Visit.