Objective: The aim of the present study was to evaluate the remaining dentin thickness (RDT) after instrumentation with different endodontic file systems through CBCT.
Materials and Methods: In the present study, 40 extracted, untreated human mandibular Premolars, with curvature less than 20° were divided into four groups (n=10, each group). Biomechanical preparation was done according to the group where, Group 1 included SS Hand K files, Group 2 included Hand ProTaper files, Group 3 included ProFile rotary files, and Group 4 included ProTaper Gold rotary files. CBCT images of Pre and Post instrumented canals were taken, and RDT was measured at 3 mm, 5 mm, and 7 mm from the radiographic root apex.
Results: Results of the present study showed that Group 2 removed the maximum amount of root dentin compared to other groups, Group 3 and 4 instrumentation techniques removed almost equal amounts of dentin while Group 1 removed the least amount of root dentin.
Conclusion: It can be concluded that engine driven Ni-Ti instruments better maintain the anatomy of the root canal during instrumentation with lesser removal of root dentin as compared to hand instruments.