Incidence of Dentinal Crack after Root Canal Preparation by ProTaper Universal, Neolix and SafeSider Systems.

INTRODUCTION: This study aimed to compare the incidence of dentinal crack formation by instrumentation with ProTaper Universal system (rotary, multi-file system), SafeSider (reciprocation movement, multi-file system) and Neolix (rotary, single-file system). METHODS AND MATERIALS: square test, Fisher's exact test and Bonferroni correction. RESULTS: =0.042). Micro cracks mainly occurred in the coronal section (9 mm). No microcrack occurred in the control group. CONCLUSION: Neolix rotary single-file system caused more dentinal cracks compared to the unprepared roots. All the instrumentation systems increased the number of micro cracks compared to unprepared teeth.