Table 4.

Friction Force (N) Values (Mean ± Standard Deviation)^a

Wire	Non–PEEK Tube	With PEEK Tube	P-Value
0.016-inch Ni-Ti	0.401 ± 0.19	0.451 ± 0.063	.53
0.016-inch Co-Cr	1.24 ± 0.08	0.94 ± 0.108	<.05
0.016-inch SS	1.09 ± 0.21	0.746 ± 0.096	<.05
0.017 × 0.025-inch Ni-Ti	1.574 ± 0.034	0.78 ± 0.301	<.01
0.017 × 0.025-inch Co-Cr	1.741 ± 0.061	0.99 ± 0.294	< 0.01
0.017 × 0.025-inch SS	1.87 ± 0.145	0.91 ± 0.033	< 0.01

^aPEEK indicates polyether ether ketone; Ni-Ti, nickel-titanium; Co-Cr, cobalt-chromium; and SS, stainless steel.