Comparative Evaluation of TruNatomy, XP Endoshaper and Hand K File Systems on Dentinal Microcrack Formation and Vertical Root Fracture Resistance – An In Vitro Study

Abstract

Background Vertical root fracture VRF accounts for 11 of failures in endodontically treated teeth. Microcracks can occur during instrumentation of root canal system with NiTi rotary files as it exerts forces increasing strain on dentinal wall which may progress to VRF. Newer file systems have been developed to reduce the risk of microcrack formation.Aim The aim of the present study was to evaluate the effect of TruNatomy XP Endoshaper and Hand K files on dentin microcrack formation and vertical root fracture resistance of root canals.Methods One hundred twenty-five extracted teeth were used in the study with 40 samples each in the experimental groups and five samples in the control group. Following instrumentation Group TRN-Trunatomy Group XPS ndash XP Endoshaper Group HF ndash Hand K File 50 of the samples were subjected to stereomicroscopic study for dentinal microcrack evaluation. The remaining samples were obturated and were subjected to Universal testing machine for vertical root fracture resistance assessment. Kruskal Wallis and Post hoc Bonferroni tests were used for statistical analysis.Results Statistically significant difference was observed between XP Endoshaper and other groups in terms of dentinal microcrack formation and vertical root fracture resistance. Significantly higher value was observed for Hand K file and TruNatomy against XP Endoshaper File p lt0.05.Conclusion TruNatomy serves as a file system causing least dentinal damage comparable to Hand K file system while XP Endoshaper caused more cracks.