question: Compared to group 2 with Path-File (Dentsply Maillefer) #1, #2, and #3 what was the result of group 1 with #10, #15 and #20 K-type (Dentsply Maillefer, Ballaigues, Switzerland) stainless steel manual files on performance of path-finding files?
context: ProTaper Next system maintained root canal curvature well and was safe to use either with path-finding files or alone.