The Paradox of Speed in Contemporary Endodontics: Techological Advances and the Overlooked Role of Irrigation time

INTRODUCTION 

Recent advances in metallurgy and heat-treated NiTi instruments have dramatically increased efficiency in root canal preparation, allowing clinicians to complete mechanical shaping in significantly less time and with fewer files.^1,2 This technological progress has undeniable benefits, but it also raises a critical question: Does the acceleration of instrumentation compromise the biological foundation of endodontic therapy?

The complexity of root canal morphology remains a major challenge. Micro-CT investigations have demonstrated that 10–80% of canal surfaces—particularly in oval and flattened canals—remain uninstrumented, irrespective of the instrumentation system utilized.³ These anatomical complexities mean that irrigation, not instrumentation, is the decisive factor for effective disinfection. Sodium hypochlorite (NaOCl), the most widely used irrigant, requires sufficient contact time to disrupt biofilms and dissolve organic tissue, yet accelerated treatments risk reducing this crucial step.

The trend toward minimally invasive endodontics (MIE) further accentuates this paradox. Conservative shaping preserves dentin and improves structural integrity, but also narrows preparation and limits mechanical debridement, thereby increasing reliance on irrigation protocols.⁴ In this context, adjunctive technology such as laser activation holds promise. It can enhance irrigant penetration and exchange, potentially compensating for reduced canal enlargement and treatment time.5 However, clinical evidence remains limited, and robust trials are needed to confirm its effectiveness in improving periapical healing outcomes.

In our view, the central challenge for contemporary endodontics is to reconcile speed, biology, and conservation. Technological efficiency must not undermine the biological requirement for thorough disinfection. Irrigation time, enhanced by but not replaced with activation methods, remains essential to achieve predictable long-term success.