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. 2024 Sep 30;12(10):317. doi: 10.3390/dj12100317

Figure 2.

Figure 2

Representative photos of the fractured surfaces of the ProTaper Next X2 instruments: (a) axial view of the fractured surface from the rotation group; (b) axial view of the fractured surface from the OTR group; (c) lateral view of the separated area from the rotation group; (d) lateral view of the separated area from the OTR group. The dimpling areas visible on the whole instrument’s axial view surfaces and the absence of plastic deformations on the tips indicate features consistent with cyclic fatigue failure.