Dentinal Microcrack Formation after Root Canal Instrumentation by XP-Endo Shaper and ProTaper Universal: A Microcomputed Tomography Evaluation

Figure 4

Micro-CT cross-sectional image of the middle third of mandibular molar mesial root: (a) preinstrumentation; (b) postinstrumentation. The MB canal instrumented with XPES (left) and the ML canal instrumented with PTU (right). One microcrack that appeared in the postinstrumentation image in the ML canal (PTU group) was the same as the preexisting microcrack observed in the preinstrumentation image. However, in the XPES group, two new incomplete microcracks were observed in the postinstrumentation image.

(a)

(b)