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Scanning Electron Microscopic Evaluation of Surface Defects of Remover Retreatment File After Single and Multiple Uses
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Surface integrity assessment of endodontic instruments after repeated use: A microscopic analysis
Faisal Naseem1, Aishwarya Sinha Mathur2, Keshav Kumar Manglam3
1Department of Conservative Dentistry and Endodontics, Dental College, Azamgarh, Uttar Pradesh, India.
Bioinformation
|July 10, 2025
Summary
Nickel-titanium (Ni-Ti) rotary files showed significant surface wear after shaping premolar canals 10 times. Twisted File had the least damage, while Mtwo exhibited the most wear, impacting instrument longevity.
Area of Science:
- Endodontics
- Materials Science
Background:
- Nickel-titanium (Ni-Ti) rotary files are crucial for root canal shaping.
- Understanding instrument surface wear is vital for clinical safety and efficacy.
Purpose of the Study:
- To evaluate the surface condition of four Ni-Ti rotary file systems after 10 uses in shaping premolar root canals.
- To compare the wear patterns and identify systems with superior durability.
Main Methods:
- Scanning Electron Microscopy (SEM) was used to examine the surface morphology of Ni-Ti rotary files.
- Four file systems (Twisted File, ProTaper Next, V Taper 2H, Mtwo) were subjected to 10 simulated root canal shaping procedures.
Main Results:
- All tested Ni-Ti rotary file systems exhibited significant surface deterioration after 10 procedures.
- Pitting increased dramatically across all systems (p < 0.001).
- Twisted File showed the least surface damage, followed by ProTaper Next and V Taper 2H. Mtwo demonstrated the most substantial wear, exceeding all other systems.
Conclusions:
- Repeated use of Ni-Ti rotary files leads to considerable surface wear and pitting.
- Instrument design influences durability, with Twisted File showing better wear resistance compared to Mtwo.
- Assessing file surface condition is essential for preventing clinical instrument failures.
