Open Access, Peer-reviewed
eISSN 2234-7666
    J Korean Acad Conserv Dent. 2008 Sep;33(5):435-442. Korean.
    Published online Sep 30, 2008.
    https://doi.org/10.5395/JKACD.2008.33.5.435
    Copyright © 2008 The Korean Academy of Conservative Dentistry
    Original Article

    A comparison of master apical file size according to instrumentation in type II root canal

    Eun-Ju Jeong, Dong-Kyun Lee, Shin-Young Baek and Ho-Keel Hwang
      • Department of Conservative Dentistry, Divsion of Dentistry, Graduate School, Chosun University, Korea.
    • Corresponding Author: Ho-Keel Hwang. Department of Conservative Dentistry, Divsion of Dentistry, Graduate School, Chosun University 421, Seosuk-dong, Gwangju, 501-825, Korea. Tel: 82-62-220-3840, Fax: 82-62-232-9064, Email: rootcanal@hanmail.net
    Received March 14, 2008; Revised April 04, 2008; Accepted September 04, 2008.

    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

    Type II root canal was defined that two canals leave the chamber and merge to form a single canal at short of the apex. The aim of this study was to analyse the master apical file (MAF) size according to various instrumentation techniques in the type II root canal when each canal was enlarged to working length.

    Eighty mesial roots of molar with ISO #15 initial apical file (IAF) size in type II root canals were randomly divided into four experimental groups with 20 teeth each. According to enlarging instruments, four groups are: K-FLEXOFILE® (KF), engine-driven Ni-Ti PROTAPER® (PT), HERO Shaper® (HS), K3 ™ (K3). All canals were enlarged to each working length with ISO #30 size: #30 in KF, F3 in PT, .04/30 in HS, and .06/30 in K3. The master apical file (MAF) size was confirmed by tactile sensation and universal testing machine (EZ test, Shimadzu Co., Kyoto, Japan). The mean MAF size was statistically compared using one-way ANOVA and Tukey HSD test at the 0.05 probability level.

    These results show that the MAF size was appeared one or two sizes larger than the final enlarging instrument when all canal in type II configuration were enlarged to each working length. Therefore, the clinician have to confirm the apical stop once more after instrumentation of type II root canal.

    Keywords
    Type II root canal; Master apical file; Initial apical file; Apical stop

    Figures

    Figure 1
    The device for taking a standard radiogragh at same position.

    Figure 2
    The apparatus and EZ test for measuring Newton value when file removed.

    Tables

    Table 1
    Group classification according to instruments

    Table 2
    Average size of master apical file in each group

    Table 3
    A comparison of master apical file size among each group

    Table 4
    Average force in each group when master apical file removed

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    MeSH Terms
    Collodion
    Dental Pulp Cavity
    Molar
    Nickel
    Sensation
    Titanium
    Tooth
    Metrics
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