Study on How the Number of Rotary Files Affects Treatment and Pain After Root Canal in Upper First Molars

What this Trial Is About

Researchers are evaluating how the number of rotary files used during root canal treatment affects the ability to reach the full working length in the second mesiobuccal MB2 canals of maxillary first molars and the level of pain experienced after the procedure. This randomized clinical trial compares single-file, two-file, three-file, and four-file rotary systems. The study focuses on patients needing primary endodontic treatment for maxillary first molars with pulp necrosis and asymptomatic apical periodontitis. Participants receive root canal treatments using one of four different rotary file systems. The single-file group uses the OneCurve system at 300 rpm and 2.5 Ncm torque. The two-file system applies the Perfect Minimally Invasive Kit with files used sequentially at similar speeds and torque under continuous irrigation. The three-file system employs VDW Rotate files with brushing-pecking motions, while the four-file system uses the Perfect Advanced Kit in a crown-down technique with specific rpm and torque settings. Each instrumentation step includes irrigation and cleaning to avoid debris buildup. During the study, postoperative pain is assessed daily for seven days using a visual analog scale VAS. Success in negotiating the working length in the MB2 canal is recorded during treatment. Participants are monitored for pain intensity and treatment progress, with follow-up visits to evaluate outcomes. The study runs from June 18, 2025, to September 5, 2025, with patients aged 20 to 65 years included based on specific dental health criteria.

Effect of Rotary File Number on MB2 Canal Negotiation and Postoperative Pain