Stereomicroscopic Evaluation of Dentinal Microcracks After Instrumentation of Curved Canal with Rotary Files in Two Motions

Objective: This study aimed to examine the effects of three distinct file systems with two motion types—rotary and reciprocation—on development dentinal microcracks after root canal preparation using a stereomicroscope. Methods: Sixty mandibular molars curvature 30° were decoronated divided into groups (Vortex Blue, Mtwo, ProTaper Next) subgroups (rotary reciprocating motions). The samples then instrumented files, dyed 1% methylene blue dye, sectioned horizontally at 3, 6, 9 mm from apex. inspected stereomicroscope 40× magnification. One-way analysis variance post hoc Tukey tests used perform statistical analysis. Results: Crack formation was statistically significant 6-mm 9-mm levels apex in both motions (p < 0.05). Among all system, Vortex Blue caused highest 6 Conclusion: resulted fewer than rotary motion. All during motions. Dentinal microcrack not