An accuracy of the several electronic apex locators on the mesial root canal of the mandibular molar

Young-Lin Cho; Wook-Hee Son; Ho-Keel Hwang

doi:10.5395/JKACD.2005.30.6.477

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Cho, Son, and Hwang: An accuracy of the several electronic apex locators on the mesial root canal of the mandibular molar

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2005; 30(6): 477-485.

Published online: 30 November 2005

DOI: https://doi.org/10.5395/JKACD.2005.30.6.477

An accuracy of the several electronic apex locators on the mesial root canal of the mandibular molar

Young-Lin Cho, Wook-Hee Son, Ho-Keel Hwang

Department of Conservative Dentistry, College of Dentistry, Chosun University, Korea.

Corresponding Author: Ho-Keel Hwang. Department of Conservative Dentistry, College of Dentistry, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju, Korea, 501-759. Tel: 82-62-220-3846, Fax: 82-62-232-9064, rootcanal@hanmail.net

Received 11 July 2005 Revised 24 August 2005 Accepted 26 August 2005

(open-access):

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

The aim of this study was to compare the length between the mesio-buccal and mesio-lingual canal of the mandibular molars before and after early coronal flaring at the different measuring time using several electronic apex locators. Fifty mandibular molars with complete apical formation and patent foramens were selected. After establishing the initial working length of the buccal and lingual canal of the mesial root using a surgical microscope (Carl Zeiss Co. Germany) at 25X with #15 K-file tip just visible at the foramen, radiographs were taken for the working length. After measuring the length of mesio-buccal and mesio-lingual canal (control group), the electronic lengths were measured at different times using several electronic apex locators (experimental groups; I-Root ZX, II-Bingo, III-Propex, IV-Diagnostic). After early coronal flaring using the K³ file, the additional electronic lengths were measured using the same manner.

The results were as follows: One canal has a correct working length for the mesial root of the mandibular molar, it can be used effectively for measuring the electronic working length of another canal when the files are superimposed or encountered at the apex. In addition, the accuracy of the electronic apex locators was increased as the measurement was accomplished after the early coronal flaring of the root canal and the measuring time was repeated.

Keywords: Electronic apex locators, Coronal flaring, Working length

Figures and Tables

Figure 1

The device for taking a standard radiograph at the same position.

Figure 2

Schematic drawing of experimental model.

Table 1

Group classification

B: Mesio-buccal root canal / L: Mesio-lingual root canal

Table 2

Average working length before and after coronal flaring at the different measuring times Unit: mm

B-L: Mesio-buccal length - Mesio-lingual length

^*Significantly different at p < 0.05 (paired t-test)

Table 3

An accuracy of electronic apex locators according to coronal flaring and mesuring time

^*Significantly different at p < 0.05 (paired t-test)

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