Comparing Post Operative Pain With and Without Apical Patency Technique in Asymptomatic Irreversible Pulpitis Teeth

Apical patency is a root canal preparation technique in which a small flexible K-file is passively passed just beyond the apical foramen to maintain canal permeability and prevent apical debris accumulation. Although this method improves irrigation flow to the apical third and reduces the risk of canal blockage, ledge formation, and transportation, its association with postoperative pain remains debatable. This randomized clinical trial aims to compare the frequency of postoperative pain between two treatment protocols in patients with asymptomatic irreversible pulpitis involving maxillary or mandibular premolars. Participants will be randomly allocated into two equal groups. In the Apical Patency Group (APG), a pre-curved #10 K-file will be gently passed 0.5 mm beyond the radiographic working length after each rotary instrument, without filing motion. In the Non-Patency Group (NPG), instrumentation and recapitulation will be strictly confined to the established working length, with no instrument intentionally passing beyond the apex. All procedures will be performed under standard endodontic protocols using rubber dam isolation, 2% lidocaine anesthesia, and 3% sodium hypochlorite irrigation. Postoperative pain severity will be self-assessed by patients using the 11-point Numerical Rating Scale (NRS) at 24 hours post-treatment. The primary outcome will be the presence or absence of pain, while secondary analysis will explore pain intensity categories (mild, moderate, severe)."