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HOME > Restor Dent Endod > Volume 34(3); 2009 > Article
Original Article Effects of anticurvature filing on danger zone width in curved root canals
Eui Seong Kim1,2, Hyun Jung Kim1, Deog Gyu Seo1, Byoung Duck Roh1,2
2009;34(3):-239.
DOI: https://doi.org/10.5395/JKACD.2009.34.3.232
Published online: May 31, 2009

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Corresponding Author: Byoung-Duck Roh. Department of Conservative Dentistry, Oral Science Research Center, College of Dentistry, Yonsei University, 250 Seongsanno, Seodaemun-Gu, Seoul 120-752, Korea. Tel: 82-2-2228-3146, Fax: 82-2-313-7575, operatys16@yuhs.ac
• Received: April 9, 2009   • Revised: April 24, 2009   • Accepted: May 1, 2009

Copyright © 2009 The Korean Academy of Conservative Dentistry

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  • The aim of this study was to compare the effects of anticurvature filing with stainless steel k-file versus nickel-titanium ProFile in the shaping of mesial root canals of extracted mandibular molars.
    A total of 60 canals from 30 mesial roots of mandibular molar teeth were randomly assigned to three groups with n=20 each. They were prepared with different instruments and methods: The first group with stainless steel k-file and circumferential filing, the second with precurved stainless steel k-file and anticurvature filing and the third with ProFile (.06 taper) and anticurvature filing. Using a micro-computed tomography system (skyscan-1076, SKYSCAN, Antwerpen, Belgium), pre-and post-operative specimens were scanned. Subsequently, canal images were superimposed and changes in root dentin thickness were measured at distal side (danger zone) of the canal. The data was analyzed using a one-way ANOVA and the comparison of means was conducted using a post hoc multiple comparison Tukey test.
    There were significant differences in the change of root dentin thickness at the 7.5~8.5mm level between group 1 and 2, 3.5~6mm level between group 1 and 3 and 3.5~6mm level between group 2 and 3(n=20, P<0.05).
  • Keywords: anticurvature filing; stainless steel k-file; nickel-titanium ProFile
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Figure 1
Pre-and Post-instrumentation canal images were superimposed and changes in root thickness were measured at distal side (danger zone) of the canal using the CTAn. Blue line is distance to external root surface pre-op and red line is post-op.
jkacd-34-232-g001.jpg
Figure 2
Change of root dentin thickness(mm) by canal preparation at danger zone before and after. At 7.5-8.5mm, significant differences were shown between group 1 and group 2(n=20, P<0.05). At 3.5-6mm, significant differences were shown between group 1 and group 3(n=20, P<0.05). At 3.5-6mm, significant differences were shown between group 2 and group 3(n=20, P<0.05).
jkacd-34-232-g002.jpg
Figure 3
Comparison of group 1 and 2. The reconstructed 3-D root canal system before and after preparation is shown and superimposed cross-section images, which shows significant difference at 7.5-8.5mm level, are also shown. In group 2, more dentin was removed in the safe zone than in the danger zone at coronal 1/3 level.
jkacd-34-232-g003.jpg
Figure 4
Comparison of group 1 and 3. The reconstructed 3-D root canal system before and after preparation is shown and superimposed cross-section images, which shows significant difference at 3.5-6mm level, are also shown.
jkacd-34-232-g004.jpg
Table 1
Change of root dentin thickness(mm) by canal preparation at danger zone (mean ± S.D.). At 7.5~8.5mm, significant differences were shown between group1 and group2 (n=20, P<0.05). At 3.5~6mm, significant differences were shown between group1 and group3, 3.5~6mm level between group 2 and 3 (n=20, P<0.05).
(B): thickness of root canal dentin at danger zone before instrumentation.
(A): thickness of root canal dentin at safe zone after instrumentation.
(V): Change values of root dentin thickness by canal preparation at danger zone.
jkacd-34-232-i001.jpg

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        Effects of anticurvature filing on danger zone width in curved root canals
        J Korean Acad Conserv Dent. 2009;34(3):232-239.   Published online May 31, 2009
        DOI: https://doi.org/10.5395/JKACD.2009.34.3.232
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      Effects of anticurvature filing on danger zone width in curved root canals
      Image Image Image Image
      Figure 1 Pre-and Post-instrumentation canal images were superimposed and changes in root thickness were measured at distal side (danger zone) of the canal using the CTAn. Blue line is distance to external root surface pre-op and red line is post-op.
      Figure 2 Change of root dentin thickness(mm) by canal preparation at danger zone before and after. At 7.5-8.5mm, significant differences were shown between group 1 and group 2(n=20, P<0.05). At 3.5-6mm, significant differences were shown between group 1 and group 3(n=20, P<0.05). At 3.5-6mm, significant differences were shown between group 2 and group 3(n=20, P<0.05).
      Figure 3 Comparison of group 1 and 2. The reconstructed 3-D root canal system before and after preparation is shown and superimposed cross-section images, which shows significant difference at 7.5-8.5mm level, are also shown. In group 2, more dentin was removed in the safe zone than in the danger zone at coronal 1/3 level.
      Figure 4 Comparison of group 1 and 3. The reconstructed 3-D root canal system before and after preparation is shown and superimposed cross-section images, which shows significant difference at 3.5-6mm level, are also shown.

      Figure 1

      Figure 2

      Figure 3

      Figure 4

      Effects of anticurvature filing on danger zone width in curved root canals

      Change of root dentin thickness(mm) by canal preparation at danger zone (mean ± S.D.). At 7.5~8.5mm, significant differences were shown between group1 and group2 (n=20, P<0.05). At 3.5~6mm, significant differences were shown between group1 and group3, 3.5~6mm level between group 2 and 3 (n=20, P<0.05).

      (B): thickness of root canal dentin at danger zone before instrumentation.

      (A): thickness of root canal dentin at safe zone after instrumentation.

      (V): Change values of root dentin thickness by canal preparation at danger zone.
      Table 1 Change of root dentin thickness(mm) by canal preparation at danger zone (mean ± S.D.). At 7.5~8.5mm, significant differences were shown between group1 and group2 (n=20, P<0.05). At 3.5~6mm, significant differences were shown between group1 and group3, 3.5~6mm level between group 2 and 3 (n=20, P<0.05). (B): thickness of root canal dentin at danger zone before instrumentation. (A): thickness of root canal dentin at safe zone after instrumentation. (V): Change values of root dentin thickness by canal preparation at danger zone.

      Table 1

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