Effect of sterilization on cyclic fatigue of rotary nickel-titanium endodontic instruments

...Increased severity in the angle and radius of the curves around which the instrument rotates decreases instrument lifespan (Pruett et al. 1997, Mize et al. 1998, Haikel et al. 1999)...
...Two investigations of the causes of instrument fracture in metal-simulated canals have concluded that rotational speed generally is not a significant factor (Pruett et al. 1997, Mize et al. 1998)...
...Previous studies using cylindrical metallic tubes to test the cyclic fatigue life of Ni–Ti rotary instruments report that the tubes do not sufficiently constrain the shafts of the smaller instruments (Pruett et al. 1997, Mize et al. 1998, Yared et al. 1999, 2000)...
...Cylindrical metallic tubes used in previous studies (Pruett et al. 1997, Mize et al. 1998, Yared et al. 1999, 2000, Melo et al. 2002) did not sufficiently restrict the instrument shaft, which would tend to regain its original straight shape, aligning into a trajectory of greater radius and reduced angle (Yared et al. 1999, 2000, Melo et al. 2002, Bahia & Buono 2005)...
...This is the point most widely used in previous cyclic fatigue studies (Pruett et al. 1997, Mize et al. 1998, Haikel et al. 1999)...

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