Methods: Fourty freshly extracted mandibular molars were used for the study. A muffle-block was constructed as given by Aviad et al. ^[8] Photographs were taken of all three cross-sections of each tooth using a DSLR Camera (Nikon Digital, Tokyo, Japan) at a fixed position. The specimens were randomly divided into the following two groups: Group l: Prepared using Wave One rotary files. Group 2: Prepared using Pro-Taper rotary files.

Results: In our study the Wave One file system exhibited better centering ability than Pro-Taper Universal file system (p<0.05) at all the three different locations coronal, middle and apical thirds of the root canals.

Conclusion: It can be concluded that Wave One file system exhibited better centering ability and required very less time to prepare the curved canals compared with Pro-Taper file system.