J Korean Acad Conserv Dent.  2008 Jul;33(4):377-388. 10.5395/JKACD.2008.33.4.377.

Comparative analysis of various corrosive environmental conditions for NiTi rotary files

• Yum JW
• Park JK
• Hur B
• Kim HC

• KMID: 2176005
• DOI: http://doi.org/10.5395/JKACD.2008.33.4.377

Abstract

The aim of the present study is to compare the corrosion tendency using two kinds of NiTi files in the various environmental conditions through the visual examination and electrochemical analysis. ProTaper Universal S2, 21 mm (Dentsply Maillefer, Ballaigues, Switzerland) and Hero 642, 0.06 tapers, size 25, 21 mm (Micromega, Besancon, France) rotary instruments were tested. The instruments were randomly divided into eighteen groups (n = 5) by the immersion temperature, the type of solution, the brand of NiTi rotary instrument and the presence of mechanical loading. Each file was examined at various magnifications using Scanning Electron Microscope (JEOL, Akishima, Tokyo, Japan) equipped with energy dispersive X-ray microanalysis (EDX). EDX was used to determine the components of the endodontic file alloy in corroded and noncorroded areas. The corrosion resistance of unused and used NiTi files after repeated uses in the human teeth was evaluated electrochemically by potentiodynamic polarization test using a potentiostat (Applied Corrosion Monitoring, Cark-in-Cartmel, UK). Solution temperature and chloride ion concentration may affect on passivity of NiTi files. Under the conditions of this in vitro study, the corrosion resistance is slightly increased after clinical use.

Keyword

NiTi file; Corrosion; Loading; Chloride; Temperature

MeSH Terms

Alloys
Androsterone
Collodion
Corrosion
Electron Probe Microanalysis
Electrons
Humans
Immersion
Tokyo
Tooth
Alloys
Androsterone
Collodion

Figure

• 

  Figure 1 Corrosion appearance of ProTaper and Hero 642. A; ProTaper in NaOCl at 55℃ B; Hero 642 in NaOCl at 55℃ C; ProTaper after immersing in NaOCl (left) and distilled water (right) at 55℃ D; Hero 642 after immersing in NaOCl (left) and distilled water (right) at 55℃.

• 

  Figure 2 SEM observation of NiTi files as representative of Group P2 (A), Group H5 (B), Group P8 (C), and Group H8 (D).

• 

  Figure 3 (A) EDX spectra of the Hero 642 instrument shown in Figure 2 B. The presence of Ni and Ti on the non-corroded areas is clearly seen. (B) EDX spectra of the Hero 642 instrument shown in Figure 2 D. Oxides are shown in corroded areas.

• 

  Figure 4 Representative potentiondynamic polarization curves of tested instruments; red line - new file and black line - used file.

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