Open Access, Peer-reviewed
eISSN 2234-7666
    J Korean Acad Conserv Dent. 2004 Jan;29(1):44-50. Korean.
    Published online Jan 31, 2004.
    https://doi.org/10.5395/JKACD.2004.29.1.044
    Copyright © 2004 Korean Academy of Conservative Dentistry
    Original Article

    Shaping ability of nickel-titaniumrotary files

    Wan-Ky Park, Hee-Joo Lee and Bock Hur
      • Department of Conservative Dentistry, College of Dentisry, Pusan National University, Korea.
    • Corresponding author: Wan-Ky Park. Department of Conservative Dentistry, College of Dentisry, Pusan National University, 1-10, Ami-dong, Seo-gu, Pusan, 602-739, Korea. Tel: 051)240-7454, Email: beatl@freechal.com

    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 compared the shaping ability of nickel-titanium rotary files with different rake angle and radial land.

    The nickel-titanium files used in this study were Profile(Dentsply, Maillefer, Ballaigues, Switzerland), Hero 642(Micromega, Besancon, France), and K3(SybronEndo, Glendora, Ca, USA) file. Resin blocks substituted for root canals. 36 resin blocks were divided into 3 groups with 12 canals each. The time for canal preparation was recorded. The images of pre- and postoperative resin canal were scanned and those were superimposed. Amounts of canal deviation, total canal widths, inner canal widths, and outer canal widths were measured at apical 1, 2, 3, 4, 5, 6, and 7mm levels.

    The amount of canal deviation was the smallest in Profile group, and the time for canal preparation was the shortest in Hero 642 group. K3 group resulted in competent characteristics in both measurements. Positive rake angle seemed to result in fast shaping of root canal and radial land guide the instrument in center of the canals and around curvatures. Radial land also tended to reduce the sense of screwing into the root canal.

    The proper selection of the nickel-titanium file based on the knowledge about file design is needed for the safer, simpler and faster root canal therapy.

    Keywords
    Shaping abiliy; Nickel-titanium rotary file; Radial land; Rake angle

    Figures

    Fig. 1
    Superimposing images of pre- and postoperative blocks

    Tables

    Table 1
    Classification of groups

    Table 2
    Design of each files

    Table 3
    Preparation sequence

    Table 4
    Time for canal preparation(second)

    Table 5
    Mean values(standard deviation) of total canal width, outer canal width, inner canal width, and amount of deviation of each groups(mm)

    Table 6
    Overview of file design

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    MeSH Terms
    Dental Pulp Cavity
    Root Canal Therapy
    Metrics
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