Residual root dentin thickness for three different rotary systems: A comparative cone beam computed tomography study.

Background: Residual root dentin thickness (RDT) in endodontically treated teeth is a major factor that is responsible for longevity of treated tooth.

Aims And Objectives: To evaluate and compare the amount of RDT during endodontic treatment using manual K-files and rotary Mtwo, ProTaper Next, and Hero shaper instruments.

Settings And Design: Anin vitro study was carried out on a sample of 100 freshly extracted human single straight rooted mandibular first premolar teeth.