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  Indian J Med Microbiol
 

Figure 2: Scanning electron microscope images of the broken instruments after the cyclic fatigue test (a, b, c = WaveOne Gold, d, e, f = Protaper Next, and g, h, i = 2Shape). The typical cyclic fatigue (ductile) fracture surface pattern with dimples and cones, crack initiation origins, smoothed borders (black arrows), and final abrupt breakage (bounded area) was observed. b, c High magnification views of the fractured area enclosed by the rectangle in image a (1500 × and × 3000, respectively). e, f High magnification views of the fractured area enclosed by the rectangle in image d (1500 × and 3000×, respectively). h, i High magnification views of the fractured area enclosed by the rectangle in image g (1500 × and 3000×, respectively)

Figure 2: Scanning electron microscope images of the broken instruments after the cyclic fatigue test (a, b, c = WaveOne Gold, d, e, f = Protaper Next, and g, h, i = 2Shape). The typical cyclic fatigue (ductile) fracture surface pattern with dimples and cones, crack initiation origins, smoothed borders (black arrows), and final abrupt breakage (bounded area) was observed. b, c High magnification views of the fractured area enclosed by the rectangle in image a (1500 × and × 3000, respectively). e, f High magnification views of the fractured area enclosed by the rectangle in image d (1500 × and 3000×, respectively). h, i High magnification views of the fractured area enclosed by the rectangle in image g (1500 × and 3000×, respectively)