Adjunctive <scp>SAF</scp> Infinitum With Continuous <scp>NaOCl</scp> / <scp>HEDP</scp> Chelation Reduces Hard‐Tissue Debris in Flattened Canals After Single‐File Preparation: A Micro‐ <scp>CT</scp> Study

The effectiveness of an adjunctive SAF Infinitum procedure performed under continuous chelation was evaluated for reducing hard-tissue debris (HTD) after single-file root canal preparation. Thirty mandibular incisors with flattened canals were pair-matched and prepared using Reciproc Blue R25 or XP-endo Rise Shaper under irrigation with 2.5% sodium hypochlorite combined with etidronic acid. Micro-computed tomography scans were obtained at baseline, after preparation and after supplementary SAF instrumentation for 2 min under continuous NaOCl/HEDP delivery. Canal volume, surface area, HTD volume and percentage reduction were quantified. Baseline morphology and post-preparation HTD did not differ between groups. The adjunctive SAF procedure significantly reduced HTD in both groups. Final residual HTD volumes after SAF use were comparable between preparation protocols, although the percentage reduction was greater after Reciproc Blue preparation. Adjunctive SAF Infinitum with continuous chelation enhanced debris removal in flattened canals irrespective of the initial shaping system.