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http://dx.doi.org/10.5395/JKACD.2005.30.2.121

THE EFFECT OF NAOCL TREATMENT AND STERILIZATION PROCEDURES ON THE CORROSION OF ENDODONTIC FILES  

Yang, Won-Kyung (Department of Conservative Dentistry, Department of Dentistry, Asan Medical Center)
Ra, Yoon-Sik (Department of Conservative Dentistry, Department of Dentistry, Asan Medical Center)
Lee , Young-Kyoo (Department of Periodontics, Department of Dentistry, Asan Medical Center)
Son, Ho-Hyun (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Kim, Mi-Ri (Department of Conservative Dentistry, Department of Dentistry, Asan Medical Center)
Publication Information
Restorative Dentistry and Endodontics / v.30, no.2, 2005 , pp. 121-127 More about this Journal
Abstract
A variety files made of stainless steel (S-S) or nickel-titanium (Ni-Ti) are used during endodontic treatment. The purpose of tt)is study was to evaluate the corrosion susceptibility of S-S and Ni-Ti endodontic files. Three brands of files were used for this study: $K-flex^{(R)}$ S-S files (Maillefer, USA), $Profile^{(R)}$ Ni-Ti files (Maillefer, USA), $K-3^{(R)}$ Ni-Ti files (SybronEndo. USA). 120 files of each brands (21mm, ISO size $\#20$) were divided into 12 groups according to 1) sterilization methods using Autoclave or Ethylene Oxide (E-O) gas, 2) Irrigation solutions using $5.25\%$ NaOCl or Saline, 3) the number of sterilization (1, 5, 10 times), After above procedures, each of the files was inspected by three examiners with a light microscope and camera at X25. Each file was judged and ranked according to the following criteria: 0;, no corrosion, 1; mild corrosion, 2; moderate corrosion, and 3; severe corrosion. The files of high score were examined under the Scanning Electron Microscope. Data were statistically analyzed with the Kruskal-Wallis test (p < 0.05). Most of the ten time-autoclaved files had showed mild to moderate corrosion. But, one or five time-autoclaved files did not show corrosive surface. NaOCl treatment and E-O gas sterilization did not influence on corrosion. There was a significant difference in corrosion susceptibility between sterilization methods and the number of autoclaving. However, there was no significant difference between brands and file materials.
Keywords
Autoclave; Ethylene; Oxide gas sterilization; NaOCl; Corrosion;
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