Comparative evaluation of the shaping performance of three NiTi rotary systems in distolingual canals of 3D-printed three-rooted mandibular first molars

Key Points

• Both single-file systems effectively shaped distolingual canals while preserving their geometry, demonstrating efficient performance.
• The WOG and OS systems showed superior shaping ability, yet OS requires careful handling in cases of severe canal curvatures.
• Assessment included a comparative analysis using a 3D-printed mandibular first molar model, highlighting the variability in canal geometry.
• Aggressive cutting performance of the PTU system led to excessive material removal, raising concerns for its suitability in distolingual canals.