Effect of Different Kinematics of Contemporary Motor-Driven File Systems on Root Dentin Cracks: An In-Vitro Study
DOI:
https://doi.org/10.52783/jns.v14.3136Keywords:
Continuous motion, Cracks, Kinematics, Reciprocal motion, RootAbstract
Objective: To evaluate and compare the root dentin crack formation after root canal preparation with different rotary instruments.
Materials and Methods: Root canals of 60 freshly extracted single-rooted premolars were prepared and randomly assigned into six groups (n=10 teeth). The root canals were instrumented with "ProTaper Next," Vortex blue, Twisted File System, Reciproc, Reciproc blue and Twisted File Adaptive motor-driven file systems having different instrumentation kinematics. Root canals of another 10 premolars were left with no preparation for the control purpose. Horizontal, 3 mm thick, slices were obtained from the apical, middle and cervical thirds of each root. The cut slices were then inspected using the digital microscope to confirm the absence or the presence of root cracks.
Results: All test subgroups showed root cracks with varied incidences. Instrumentation with "ProTaper Next," system, vortex blue and TF system with continuous motion.
showed higher incidences of cervical root cracks in comparison to the control and other study groups.
Conclusion: Although dentin cracking is possible in premolar roots prepared with motor- driven file systems, higher incidences of cervical root cracks are expected with canals instrumented with file systems in continuous rotation motion.
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