Fracture Resistance of K3 Nickel-Titanium Files Made from Different Thermal Treatments

Table 1

Cyclic fatigue resistance and torsional resistance (mean ± standard deviation).

	Cyclic fatigue resistance	Torsional resistance
	NCF	UTS (Ncm)	ARF (°)
K3
K3XF
K3H

Different superscript letters in the same column indicate a statistically significant difference between groups ().
NCF: number of cycles to fracture; UTS: ultimate torsional strength; ARF: angle of rotation to fracture.