Evaluation of type of kinematics on glide path procedures and torsional fatigue resistance after preparation of moderately curved canals

Sixty moderately curved canals of mandibular molars classified as Vertucci’s type IV canal configuration were selected by micro-CT 1174. The teeth divided into two groups according to the kinematics used, whether reciprocating or rotary motion (n=30, totaling 60 mesial root canals). instruments used perform glide path procedures had identical features (0.15 mm tip size, 0.04 mm/mm taper, thermal treatment, and square cross-section), but differed in direction cutting blade. duration procedure absolute percentage frequency reach full working length recorded. torsional test (3630-1; 1992) was performed on both unused instruments, evaluate a possible reduction resistance when using procedure. Statistical analysis unpaired t-test chi-square test, level significance set at 5%. affected procedures, seemed induce less stress during procedures.