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HOME > Restor Dent Endod > Volume 30(2); 2005 > Article
Original Article The effect of NaOCl treatment and sterilization procedures on the corrosion of endodontic files
Won-Kyung Yang1, Yoon-Sik Ra1, Young-Kyoo Lee2, Ho-Hyun Son3, Mi-Ri Kim1
2005;30(2):-127.
DOI: https://doi.org/10.5395/JKACD.2005.30.2.121
Published online: March 31, 2005

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Corresponding author: Mi-Ri Kim. Department of Conservative Dentistry, Department of Dentistry, Asan Medical Center, 388-1, Poongnap-dong, Songpa-gu, Seoul, Korea, 138-736. Tel: 82-2-3010-3824, Fax: 82-2-3010-6967, kmr333@unitel.co.kr
• Received: August 30, 2004   • Revised: October 28, 2004   • Accepted: November 9, 2004

Copyright © 2005 Korean Academy of Conservative Dentistry

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  • A variety files made of stainless steel (S-S) or nickel-titanium (Ni-Ti) are used during endodontic treatment. The purpose of this 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® S-S files (Maillefer, USA), Profile® Ni-Ti files (Maillefer, USA), K-3® 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: K-flex® file; Profile®; K-3® file; Autoclave; Ethylene Oxide gas sterilization; NaOCl; Corrosion
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Figure 1
Low magnification of untreated K-flex® file, Profile®, and K-3® file (SEM photo).
jkacd-30-121-g001.jpg
Figure 2
SEM photographs of K-flex® file treated with sodium hypochlorite and autoclaved ten-times (left arrow; fissure line, right arrows; pitting).
jkacd-30-121-g002.jpg
Figure 3
Low magnification (left) and high magnification (right) of Profile® treated with sodium hypochlorite and autoclaved ten-times (arrow; pitting)
jkacd-30-121-g003.jpg
Figure 4
Low magnification (left) and high magnification (right) of K-3® file treated with sodium hypochlorite and autoclaved ten-times (arrows; pitting).
jkacd-30-121-g004.jpg
Figure 5
Sum of corrosion scores of autoclaved files (O; NaOCl, X; Saline).
Ten times-autoclaved files had significantly different from one or five times-autocaved files (p < 0.05). There was no significant difference between brands and file materials.
jkacd-30-121-g005.jpg
Figure 6
Sum of corrosion scores of E-O gas sterilized files (O; NaOCl, X; Saline).
EO-gas sterilized files did not showed significantly different from each other (p < 0.05). There was no significant difference between brands and file materials.
jkacd-30-121-g006.jpg
Table 1
Classification of the experimental groups. The files in each group were immersed in 5.25% sodium hypochlorite or normal saline for 10 minutes before sterilization (36 groups, n = 10 / group).
jkacd-30-121-i001.jpg

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      Suganthi Ranganathan, Supriya Manvi, Srivatsa Gopalakrishna, Chaitra Koppal Renukanath
      International Journal of Prosthodontics and Restorative Dentistry.2017; 7(3): 97.     CrossRef

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      The effect of NaOCl treatment and sterilization procedures on the corrosion of endodontic files
      J Korean Acad Conserv Dent. 2005;30(2):121-127.   Published online March 31, 2005
      DOI: https://doi.org/10.5395/JKACD.2005.30.2.121
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    The effect of NaOCl treatment and sterilization procedures on the corrosion of endodontic files
    Image Image Image Image Image Image
    Figure 1 Low magnification of untreated K-flex® file, Profile®, and K-3® file (SEM photo).
    Figure 2 SEM photographs of K-flex® file treated with sodium hypochlorite and autoclaved ten-times (left arrow; fissure line, right arrows; pitting).
    Figure 3 Low magnification (left) and high magnification (right) of Profile® treated with sodium hypochlorite and autoclaved ten-times (arrow; pitting)
    Figure 4 Low magnification (left) and high magnification (right) of K-3® file treated with sodium hypochlorite and autoclaved ten-times (arrows; pitting).
    Figure 5 Sum of corrosion scores of autoclaved files (O; NaOCl, X; Saline). Ten times-autoclaved files had significantly different from one or five times-autocaved files (p < 0.05). There was no significant difference between brands and file materials.
    Figure 6 Sum of corrosion scores of E-O gas sterilized files (O; NaOCl, X; Saline). EO-gas sterilized files did not showed significantly different from each other (p < 0.05). There was no significant difference between brands and file materials.

    Figure 1

    Figure 2

    Figure 3

    Figure 4

    Figure 5

    Figure 6

    The effect of NaOCl treatment and sterilization procedures on the corrosion of endodontic files

    Classification of the experimental groups. The files in each group were immersed in 5.25% sodium hypochlorite or normal saline for 10 minutes before sterilization (36 groups, n = 10 / group).
    Table 1 Classification of the experimental groups. The files in each group were immersed in 5.25% sodium hypochlorite or normal saline for 10 minutes before sterilization (36 groups, n = 10 / group).

    Table 1

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