Glide path in rotary endodontics

Glide path preparation is a critical preliminary phase in rotary endodontic treatment that promotes safer and more controlled use of nickel–titanium (NiTi) instruments. It consists of establishing a smooth and reproducible channel from the canal entrance to the apical terminus, enabling shaping files to progress apically with minimal resistance. The presence of a confirmed glide path decreases torsional stress and cyclic fatigue on rotary instruments, thereby lowering the likelihood of instrument fracture, canal deviation, and apical obstruction, while improving working length accuracy and shaping precision. Glide paths can be developed using stainless steel hand K-files, mechanically activated hand files, or dedicated NiTi rotary systems. Manual techniques provide enhanced tactile sensation but may require more time and operator skill. In contrast, rotary NiTi glide path systems increase efficiency, better maintain original canal morphology, and are associated with reduced postoperative discomfort. Clinically, a small hand file commonly size #10 should advance to working length without binding to confirm adequacy of the pathway. In summary, careful glide path establishment forms the foundation of successful rotary canal preparation by enhancing instrument safety, preserving anatomy, and improving overall treatment predictability.