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Fig. 2 | BMC Oral Health

Fig. 2

From: In vitro comparison of cyclic fatigue resistance of TruNatomy in single and double curvature canals compared with different nickel-titanium rotary instruments

Fig. 2

SEM images (× 200) of fractured fragments in double curvature canals. Fracture of instruments in apical curvature (a-d) and coronal curvature (e-h). (a, e) TRN, (b, f) HCM, (c, g) VB and (d, h) RC; respectively. The following features could be observed: the origin of the crack (arrow), fatigue zone (f), and overload fast fracture zone (o)

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