introduction: we aimed to compare apical canal transportation of extracted teeth and two types of simulated resin blocks. materials and methods: mesiobuccal root of extracted maxillary molars, high hardness simulated resin blocks (knoop hardness=40) and low hardness simulated resin blocks (knoop hardness=22) were prepared with k-files using step-back technique (n=15 canals in each group). doubl...

introduction: to compare the cleaning effectiveness of k3 and race niti rotary systems with k-flexo file instruments during the preparation of curved canals in extracted human teeth. materials and methods: a total of 50 root canals of mandibular and maxillary molars with curvatures ranging between 25º and 35 º were divided in three groups of 15 each and 5 as negative control groups. canals were...