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HOME > Restor Dent Endod > Volume 31(3); 2006 > Article
Original Article Effect of rotational speed of Protaper™ rotary file on the change of root canal configuration
Min-Chul Seo, Yoon-Jeong Jeon, In-Chol Kang1, Dong-Jun Kim, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
2006;31(3):-185.
DOI: https://doi.org/10.5395/JKACD.2006.31.3.179
Published online: May 31, 2006

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Corresponding Author: Won-Mann Oh. Department of Conservative Dentistry, School of Dentistry, Chonnam National Universtiy, 8 Hak-dong, Dong-gu, Gwangju, Korea, 501-757. Tel: 82-62-220-4431, Fax: 82-62-225-8387, wmoh@chonnam.ac.kr
• Received: October 13, 2005   • Revised: January 16, 2006   • Accepted: January 20, 2006

Copyright © 2006 Korean Academy of Conservative Dentistry

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  • This study was conducted to evaluate canal configuration after shaping by ProTaper™ with various rotational speed in J-shaped simulated resin canals.
    Forty simulated root canals were divided into 4 groups, and instrumented using by ProTaper™ at the rotational speed of 250, 300, 350 and 400 rpm. Pre-instrumented and post-instrumented images were taken by a scanner and those were superimposed. Outer canal width, inner canal width, total canal width, and amount of transportation from original axis were measured at 1, 2, 3, 4, 5, 6, 7 and 8 mm from apex. Instrumentation time, instrument deformation and fracture were recorded. Data were analyzed by means of one-way ANOVA followed by Scheffe's test.
    The results were as follows

    1. Regardless of rotational speed, at the 1~2 mm from the apex, axis of canal was transported to outer side of a curvature, and at 3~6 mm from the apex, to inner side of a curvature. Amounts of transportation from original axis were not significantly different among experimental groups except at 5 and 6 mm from the apex.

    2. Instrumentation time of 350 and 400 rpm was significantly less than that of 250 and 300 rpm (p < 0.01).

    In conclusion, the rotational speed of ProTaper™ files in the range of 250~400 rpm does not affect the change of canal configuration, and high rotational speed reduces the instrumentation time. However, appearance of separation and distortion of Ni-Ti rotary files can occur in high rotational speed.
  • Keywords: Rotational speed; Canal configuration; Image analysis
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Figure 1
Pre-instrumentation image. Working length was 16 mm, the round circles were the landmark for getting the superimposed image.
jkacd-31-179-g001.jpg
Figure 2
The diagram indicates the points at which the canal width was measured after superimposition of pre-instrumentation and post-instrumentation image.
jkacd-31-179-g002.jpg
Table 1
Mean values (± SD) of outer, inner, total canal width, and amount of transportation after shaping with various rotational speed (mm)

Minus value indicates that axis of canal was transported to inner side curvature after canal preparation.

The different letter means significant difference between groups (p < 0.05).

jkacd-31-179-i001.jpg
Table 2
Instrumentation time for the canal preparation with various rotational speed

**: significant difference (p < 0.01).

jkacd-31-179-i002.jpg

Tables & Figures

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    • An evaluation of rotational stability in endodontic electronic motors
      Se-Hee Park, Hyun-Woo Seo, Chan-Ui Hong
      Journal of Korean Academy of Conservative Dentistry.2010; 35(4): 246.     CrossRef

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      Effect of rotational speed of Protaper™ rotary file on the change of root canal configuration
      J Korean Acad Conserv Dent. 2006;31(3):179-185.   Published online May 31, 2006
      DOI: https://doi.org/10.5395/JKACD.2006.31.3.179
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    Effect of rotational speed of Protaper™ rotary file on the change of root canal configuration
    Image Image
    Figure 1 Pre-instrumentation image. Working length was 16 mm, the round circles were the landmark for getting the superimposed image.
    Figure 2 The diagram indicates the points at which the canal width was measured after superimposition of pre-instrumentation and post-instrumentation image.

    Figure 1

    Figure 2

    Effect of rotational speed of Protaper™ rotary file on the change of root canal configuration

    Mean values (± SD) of outer, inner, total canal width, and amount of transportation after shaping with various rotational speed (mm)

    Minus value indicates that axis of canal was transported to inner side curvature after canal preparation.

    The different letter means significant difference between groups (p < 0.05).

    Instrumentation time for the canal preparation with various rotational speed

    **: significant difference (p < 0.01).
    Table 1 Mean values (± SD) of outer, inner, total canal width, and amount of transportation after shaping with various rotational speed (mm)

    Minus value indicates that axis of canal was transported to inner side curvature after canal preparation.

    The different letter means significant difference between groups (p < 0.05).

    Table 2 Instrumentation time for the canal preparation with various rotational speed

    **: significant difference (p < 0.01).

    Table 1

    Table 2

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