الفهرس 
Title : Comparison of Postoperative Pain after Root Canal Instrumentation Using Reciproc and ProTaper Next in Asymptomatic Necrotic Molars: A Randomized Clinical
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Abstract
Aim: The purpose of this study was to clinically compare the incidence and intensity of postoperative pain after root canal preparation using a reciprocating system (Reciproc) and a continuous rotary system (ProTaper Next) in asymptomatic necrotic mandibular molars. Methods: Sixty patients with asymptomatic necrotic mandibular molars were included. After confirming the diagnosis clinically and radiographically, patients were randomly assigned into two equal groups of 30 patients each. Standard endodontic treatment was performed in two visits. The patients in the intervention group were treated using reciproc reciprocating files during cleaning and shaping; While ProTaper Next rotary files were used during cleaning and shaping of root canals in patients assigned to the comparator group. 2.5% sodium hypochlorite was used for irrigation and obturation was performed a week later using the modified single cone technique with a resin sealer. Pain was assessed pre-operatively and the tooth was confirmed to be asymptomatic, then after 6, 12, 24 and 48 hours after root canals instrumentation, and after 6 and 12 hours following root canal obturation. Numeric pain rating scale (NRS) was used as the primary outcome measure. Patients were given a placebo to be administred in case of mild pain and an analgesic was prescribed in case of emergency and were asked to record whether they had taken any placebo or analgesics and the number of analgesic tablets taken. All demographic data and NRS scores were collected from the patients and statistically analyzed. The time required to complete instrumentation for each patient was recorded and statistically analyzed as the secondary outcome measure. Incidence of swelling and/or pain on biting was also recorded and statistically analyzed