The Effect of Electrolyte Concentration and Electric Potential On Electrochemical Dissolution of HyFlex EDM Endodontic Files (An In-vitro study)

Document Type : Original Article

Authors

1 Master student

2 Professor of endodontics Cairo University

3 Department of Endodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt.

4 Professor in the faculty of engineering and materials science german university in cairo

Abstract

Aim: To assess the effect of electrolyte concentration and electric potential on electrochemical dissolution of NiTi samples and HyFlex EDM files in simulated root canals.
Methodology: This study involved acquiring anodic polarization curves and redox curves to establish the requisite conditions for dissolving endodontic files. Anodic polarization of 12 NiTi samples and 3 HyFlex EDM files was implemented, and a comparative analysis using analysis of variance (P < 0.05) was conducted to assess the impact of varying concentrations of solutions and applied potentials. Two solutions were used: solution 1 [12 g/L NaF + 1 g/L NaCl] and solution 2 [12 g/L NaF + 180 g/L NaCl] at 2 different potentials 200 mV versus.SCE (saturated calomel electrode) and 400 mV vs.SCE. This polarization was conducted to evaluate the dissolution of NiTi samples and HyFlex EDM (Electrical Discharge Machining) files within simulated root canals. Furthermore, a scanning electron microscope with embedded EDX (Energy Dispersive X-Ray Analysis) was used to examine the corrosion behavior of the tested samples.
Results: Solution 2 [12 g/L NaF + 180 g/L NaCl] at 400 mV vs.SCE was associated with the most corrosive effect. Observation of the HyFlex EDM file tip revealed a gradual reduction in its size within the initial 30-minutes period. Anodic polarization of file fragments in simulated root canals for 60 minutes led to their partial dissolution.
Conclusion: Within simulated root canals, the anodic polarization of HyFlex EDM instruments at a current of 10 mA/electrode led to their gradual consumption as the polarization time increased.

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Advanced Dental Journal
Volume 7, Issue 3
July 2025
Pages 490-507

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