Comparison of full rotation and reciprocating movements in regaining apical patency during endodontic retreatment

Background: This study aimed to compare the continuous rotation and reciprocating movements of rotary files in achieving apical patency root canal retreatment. Materials Methods: vitro, experimental evaluated 64 extracted mandibular molars. The teeth were prepared up F3 with ProTaper Universal obturated using lateral compaction technique. divided into four groups (n = 16) based on mesiobuccal curvature (Schneider’s method) type rotational movement. Groups 1 2 included straight retreated WaveOne Gold Retreatment system, respectively. 3 4 moderately curved canals Universal, Apical was ensured by observing tip a hand K‑file at foramen. Data analyzed Fisher’s exact test. P < 0.05 considered statistically significant. Results: successfully achieved all 16 group (100%) 15 (93.75%). No significant difference noted between (P 1.00). (93.75%) 12 (75%). either 0.333). Conclusion: Both are equally effective or Key Words: Retreatment, preparation,