Torsional and Bending Properties of V Taper 2H, ProTaper NEXT, NRT, and One Shape

Table 1

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

Group	Minimum	Maximum	Mean (SD)
OS	1	1	1 (0)^a
PTN	1	2	1.4 (0.55)^a,b
NRT	1	8	3.6 (2.88)^b
V2H	79	140	114.4 (22.22)^c

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