Open Access, Peer-reviewed
eISSN 2234-7666
    J Korean Acad Conserv Dent. 2006 May;31(3):179-185. Korean.
    Published online May 31, 2006.
    https://doi.org/10.5395/JKACD.2006.31.3.179
    Copyright © 2006 Korean Academy of Conservative Dentistry
    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 Kang,1 Dong-Jun Kim, Yun-Chan Hwang, In-Nam Hwang and Won-Mann Oh
      • Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Korea.
      • 1Department of Oral Microbiology, School of Dentistry, Dental Science Research Institute, Chonnam National University, Korea.
    • 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, Email: wmoh@chonnam.ac.kr
    Received October 13, 2005; Revised January 16, 2006; Accepted January 20, 2006.

    This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

    Abstract

    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

    Figures

    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.

    Tables

    Table 1
    Mean values (± SD) of outer, inner, total canal width, and amount of transportation after shaping with various rotational speed (mm)

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

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    MeSH Terms
    Axis, Cervical Vertebra
    Dental Pulp Cavity*
    Transportation
    Metrics
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    Tables
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