Post-Instrumentation Dentinal Microcracks Induced by Two NiTi Rotary Systems with Increased Super Elasticity and Shape Memory: A MicroCT Comparative and Methodological Ex Vivo Study

This study aimed to determine the incidence of dentinal microcracks after instrumenting root canals maxillary premolars using two novel rotary instrumentation systems. Micro-computed tomography (microCT) scans and images generated by sectioning observation with a stereomicroscope were used assess specimens. Twenty-two freshly extracted collected specimens divided into groups eleven. The tested radicular shaping systems XP-Endo shaper TRUShape (i.e., single file). scanned microCT pre- post-instrumentation, newly formed detected. post-instrumentation also compared obtained method inspection, comparing in either or images. results identified an overall 0.49% microcracks, no statistically significant differences (p = 0.689) between (0.11% for 0.87% shaper). There < 0.001) (16.6% more latter). In conclusion, show that neither nor created during canal instrumentation. evaluation overestimates presence difference scans.