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

• Published in: Dental research journal 2021-01, Vol.18 (1), p.85-85
• Main Authors: Nouri, Hadi, Amini, Kamal, Jahromi, Maryam Zare
• Format: Article
• Language: English
• Subjects: Original; retreatment; root canal preparation; rotation
• ISSN: 1735-3327; 2008-0255
• DOI: 10.4103/1735-3327.328753

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