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Related Experiment Video

Updated: Jul 13, 2026

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
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Electrochemical Properties of Nickel-Titanium Rotary Endodontic Instruments.

Vidyalakshmi Subramanian1, Howard W Roberts2, Shengtong Han3

  • 1Department of General Dental Sciences-Dental Biomaterials Marquette University School of Dentistry, Milwaukee, Wisconsin.

Journal of Endodontics
|May 18, 2024
PubMed
Summary

Corrosion resistance varied significantly among nickel-titanium endodontic files in saline and sodium hypochlorite. Differences were noted in corrosion rates and types, but no clear trend emerged based on file treatment.

Keywords:
Corrosion currentendodontic rotary filesnickel-titaniumsalinesodium hypochlorite

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Electrochemistry

Background:

  • Nickel-titanium (NiTi) rotary endodontic files are widely used.
  • Innovations include heat-treated and surface-treated NiTi files.
  • Understanding their corrosion properties is crucial for clinical safety.

Purpose of the Study:

  • To investigate and compare the corrosion behavior of various NiTi endodontic files.
  • To evaluate file performance in normal saline and sodium hypochlorite (NaOCl).

Main Methods:

  • Ten NiTi file brands (size 40, 0.04 taper) underwent electrochemical testing.
  • Tests included Open Circuit Potential (OCP) and cyclic polarization in saline and NaOCl.
  • Statistical analysis used Nonparametric ANOVA and pairwise comparisons (P < .05).

Main Results:

  • Significant differences in OCP and corrosion current (Icorr) were found among file brands in both solutions.
  • Nine files showed higher Icorr in NaOCl compared to saline.
  • Pitting corrosion occurred in saline but not in NaOCl.

Conclusions:

  • Electrochemical properties varied significantly across the ten NiTi file brands.
  • No consistent trend in OCP or Icorr was observed related to conventional, heat-treated, or surface-treated files.
  • NiTi file brand and solution type influence electrochemical behavior.