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Updated: Aug 29, 2026

Scanning Electron Microscopic Evaluation of Surface Defects of Remover Retreatment File After Single and Multiple Uses
Published on: October 11, 2024
Assessment of dentinal microcrack formation following root canal preparation with rotary, reciprocating and
Parthivi Singh1, Sana Khan1, Pooja Sinha2
1Department of Conservative dentistry and Endodontics, Peoples dental Academy, Peoples University, Bhopal, Madhya Pradesh, India.
Abstract:
Dentinal microcrack formation during root canal preparation is a critical concern as it predisposes to vertical root fracture and treatment failure. Therefore, it is of interest to evaluate microcrack formation after instrumentation with three nickel-titanium systems (ProTaper Gold, WaveOne Gold and HyFlex EDM) using high-resolution micro-computed tomography. Hence, sixty human mandibular premolars (n=20 per group) were scanned pre-and post-instrumentation and microcracks were assessed for number, length and depth by blinded examiners. WaveOne Gold showed the highest microcrack formation, ProTaper Gold demonstrated intermediate values and HyFlex EDM exhibited the least dentinal damage, with statistically significant differences among groups (p<0.05). Heat-treated NiTi instruments produced fewer microcracks, indicating that file design and kinematics significantly influence dentinal integrity during root canal preparation.
