Aim: The aim of this study was to compare the canal transportation, canal centering ability, change in curvature and loss of working length after instrumentation with Revo S and K3XF file system by using cone beam computed tomography (CBCT).
Materials and Methods: Hundred mesiobuccal canals of first and second molars with an angle of curvature ranging from 15 to 45 degrees were divided according to the instrument used in canal preparation into two groups of fifty samples each: Revo S (group I) and K3XF (group II). The teeth were instrumented according to manufacturer’s guidelines, with all groups being prepared to size 25, 0.06 taper master apical file. Canals were scanned using CBCT scanner before and after preparation to evaluate the transportation, centering ratio at 3 mm, 6mm and 9 mm from the apex and change in canal curvature. The change in working length was measured with Apex ID (Sybron Endo) apex locator in thirty patients after instrumentation with Revo S (group III) and K3XF (group IV) file system. The data collected were evaluated using student ‘t’ and Mann-whitney test.
Results: K3XF file system showed less mean canal transportation, better canal centering ability values and maintained the original canal curvature well as compared to Revo S file system but the results were statistically insignificant (p > 0.05). There was no significant difference between two groups regarding change in working length after instrumentation.
Conclusion: Although the canal transportation, centring ability, change in canal curvature and loss of working length was less for K3XF file system but the results were statistically insignificant.