Objectives The aim was to evaluate dentinal crack formation after root canal preparation with ProTaper Next system (PTN) with and without a glide path. Materials and Methods Forty-five mesial roots of mandibular first molars were selected. Fifteen teeth were left unprepared and served as controls. https://www.countryscenesaddleryandpetsuppliers.shop/product-category/classic-ropes-zoom-kids-rope/