DOI: 10.4103/jispcd.jispcd_3_26 ISSN: 2231-0762

Efficacy of Passive Ultrasonic Versus Sonic Irrigation for the Removal of Filling Material After Retreatment of Oval Canals: A Micro-CT Study

Sherihan E. Zongova-Adem, Irina K. Tsenova-Ilieva, Violeta D. Dogandzhiyska, Vasil G. Christoff, Iliyana L. Stoeva, Emilia G. Karova
Show PDF Cite

Abstract

Objective:

The aim of this study was to evaluate and compare the efficacy of two distinct irrigation techniques—passive ultrasonic (IrriSafe) and sonic irrigation (EndoActivator)—following the use of the D-Race retreatment system in oval-shaped root canals.

Methods:

Twenty-four mandibular incisors with a single oval-shaped canal were instrumented, obturated, and subsequently randomly assigned into two groups ( n  = 12). Both groups underwent initial retreatment using the D-Race retreatment system. Following this, supplementary irrigation protocols were applied. Group 1 received passive ultrasonic irrigation (PUI) using the IrriSafe ultrasonic tip, while Group 2 was treated with sonic irrigation using the EndoActivator. Micro-computed tomography scans were performed at three time points: after root canal obturation, after the initial retreatment with the D-Race system, and after the supplementary irrigation protocols. Statistical analysis was conducted using the nonparametric Wilcoxon signed-rank and Mann–Whitney U tests, with the significance level set at 0.05.

Results:

Neither method resulted in complete elimination of the root canal filling material. However, both irrigation techniques enhanced canal cleanliness following the use of the D-Race system. Notably, PUI demonstrated superior effectiveness in the apical third of the root canal compared to sonic irrigation with the EndoActivator ( P = 0.043).

Conclusion:

Within the limitations of this study, PUI was more effective than sonic irrigation for removing the residual filling material from the apical third of oval canals during endodontic retreatment.

More from our Archive