Comparison of influencess of pathfile and manual file in reduce of instrument fractyre in the protaper rotary system

The new Path File rotary instruments for mechanical pre flaring were recently introduced and it has been claimed to possess numerous merits in the canal preparations. The present study compared the fracture rates during mechanical pre flaring by using manual (k-files) and Path File in the Pro Taper rotary system. This experimental in vitro study was done on 100 acrylic blocks with the similar curve and working length. The root canals were randomly received mechanical pre flaring using Path File and manual k-files in the blocks. The number of the fractured files was determined when S1, S2, F1, F2 and F3 files would maintained the working length during the repeated uses. The results of both groups were compared by Kaplan-Meier (Log Rank) statistical test. In the manual system, no case of fractures was seen in S1, S2 and F1 files, however, 2 files fractured after 7th use in F2 and 3 files fractured after 5th use in the F3 files. No Path file was fractured in S1 too. But, in S2, 1 file was fractured after 6th uses, 2 files fractured in F1 after 6th uses, 2 files fractured in F2 after 7th uses and 4 files fractured in F3 after 5th uses. No significant differences were observed between two systems regarding the number of fractured files (p>0.14). According to the results, Path File rotary system does not show better results during mechanical pre flaring when compared to manual instruments, although no significant differences were noted between two systems.