Antakya

Researchers are studying how the number of rotary files used affects the success of working length negotiation and postoperative pain in the second mesiobuccal (MB2) canals of maxillary first molars. This randomized clinical trial includes patients needing primary root canal treatment for these teeth, focusing on cases with pulp necrosis and asymptomatic apical periodontitis. The study aims to compare systems using one, two, three, or four rotary files and how they influence pain and treatment success. Participants are assigned to one of four groups based on the rotary file system used: a single-file NiTi system operated at 300 rpm and 2.5 Ncm torque; a two-file system using specific shaper and finisher files at 300 rpm and 2.0-2.5 Ncm torque; a three-file NiTi rotary system applied sequentially with brushing-pecking motion under continuous irrigation; or a four-file system used in a crown-down sequence with varying rpm and torque settings. Each system is carefully applied to the MB2 canal following specific protocols. After treatment, patients report their pain daily for seven consecutive days using a visual analog scale (VAS). Researchers also record the success of negotiating the working length during canal instrumentation. The study collects these measurements to assess postoperative pain intensity and treatment effectiveness. Participants must be able to attend follow-up visits and communicate effectively during the study period, which involves daily pain assessments for one week after treatment.