Comparison of magnetic nanoparticle-activated irrigation with ultrasonic irrigation for biofilm elimination

Abstract

Successful elimination of microbial biofilms from the root canal system remains one of the greatest challenges in endodontic therapy because of the complexity of canal anatomy and the resistance of organized biofilm communities to conventional irrigation methods. Advanced irrigation activation techniques have therefore been developed to improve disinfectant penetration and enhance biofilm disruption. Among these, magnetic nanoparticle-activated irrigation has emerged as an innovative approach that employs externally controlled magnetic particles to improve mechanical disruption and irrigant distribution within inaccessible regions of the root canal system. Ultrasonic irrigation, an established activation technique, enhances cleaning through acoustic streaming and cavitation, facilitating the removal of debris, smear layer, and microbial biofilms. This review compares the mechanisms, antimicrobial effectiveness, cleaning efficiency, clinical applicability, advantages, and limitations of magnetic nanoparticle-activated irrigation and ultrasonic irrigation for biofilm elimination. Evidence indicates that both techniques significantly improve root canal disinfection compared with conventional irrigation, although they differ in activation mechanisms, equipment requirements, and current levels of clinical validation. While ultrasonic irrigation remains the more widely adopted technique because of its established clinical evidence, magnetic nanoparticle-activated irrigation demonstrates promising potential for improving biofilm disruption in anatomically complex canals. Continued laboratory investigations and well-designed clinical studies are necessary to determine its long-term effectiveness, safety, and feasibility for routine endodontic practice.