Evaluation of remaining dentin thickness following use of three different rotary nickel-titanium retreatment files: A cone-beam computed tomography study.

Aim: The aim of the study is to measure the amount of remaining dentin thickness (RDT) following retreatment using three different rotary nickel-titanium (NiTi) systems.

Methodology: Mesiobuccal roots of 45 extracted maxillary first molars were prepared up to F ProTaper File and obturated. After cone-beam computed tomography (CBCT) imaging, to evaluate the obturation, the samples were randomly assigned to three retreatment groups ( = 15).