Table 1: Results of torsional fatigue resistance tests (n = 10/group).

GroupMinimumMaximumMean (SD)

OS111 (0)a
PTN121.4 (0.55)a,b
NRT183.6 (2.88)b
V2H79140114.4 (22.22)c

OS, One Shape; PTN, ProTaper NEXT; V2H, V taper 2H. Groups with different superscript letters indicate a statistically significant difference.