Role of Surface tension and Viscosity of Endodontic Irrigants in Cleaning and Shaping of Root Canals

AbstractEffective endodontic therapy depends not just on mechanical instrumentation, but critically on chemical irrigation to remove microbes from inaccessible areas of the root canal system. Among the key physicochemical factors, surface tension and viscosity govern how well irrigants can penetrate, wet, and clean complex canal anatomy. Lower surface tension improves irrigant spreading and canal penetration, while optimal viscosity supports efficient flow and debris removal. Recent innovations including surfactant addition, temperature adjustment, and advanced activation methods are designed to enhance these properties, resulting in better debridement and microbial control. This review delves into the intricate mechanisms by which surface tension and viscosity modulation enhance the performance of endodontic irrigants, highlighting their profound clinical implications in achieving superior root canal disinfection and improving treatment outcomes.