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http://dx.doi.org/10.5395/JKACD.2008.33.4.377

Comparative analysis of various corrosive environmental conditions for NiTi rotary files  

Yum, Ji-Wan (Department of Conservative Dentistry, School of Dentistry Pusan National University)
Park, Jeong-Kil (Department of Conservative Dentistry, School of Dentistry Pusan National University)
Hur, Bock (Department of Conservative Dentistry, School of Dentistry Pusan National University)
Kim, Hyeon-Cheol (Department of Conservative Dentistry, School of Dentistry Pusan National University)
Publication Information
Restorative Dentistry and Endodontics / v.33, no.4, 2008 , pp. 377-388 More about this Journal
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.
Keywords
NiTi file; Corrosion; Loading; Chloride; Temperature;
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