A comparison of the length between mesio-buccal and mesio-lingual canals of the mandibular molar

Seul-Hee Park; Bong-Hwan Noh; Ho-Keel Hwang

doi:10.5395/JKACD.2004.29.6.541

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Park, Noh, and Hwang: A comparison of the length between mesio-buccal and mesio-lingual canals of the mandibular molar

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2004; 29(6): 541-547.

Published online: 30 November 2004

DOI: https://doi.org/10.5395/JKACD.2004.29.6.541

A comparison of the length between mesio-buccal and mesio-lingual canals of the mandibular molar

Seul-Hee Park, Bong-Hwan Noh, 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

(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 initial apical file (IAF) length between the mesio-buccanl and mesio-lingual canals of the mandibular molar before and after early coronal flaring. 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 the Root-ZX, radiographs were taken for the working length with a 0.5 mm short of #15 K-file tip just visible at the foramen under a surgical microscope (OPMI 1-FC, Carl Zeiss Co. Germany) at 25X. After early coronal flaring using the K³ file, additional radiographs were taken using the same procedure. The root canal morphology and the difference in working length between the buccal and lingual canals were evaluated.

These results show that the difference in the length between the mesio-buccal and mesio-lingual canals of the mandibular molar was ≤ 0.5 mm. If one canal has a correct working length for the mesial root of the mandibular molar, it can be used effectively for measuring the working length of another canal when the files are superimposed or loosening. In addition, the measured the working length after early coronal flaring is much more reasonable because the difference in the length between the mesio-buccal and mesio-lingual canals can be reduced.

Keywords: Early coronal flaring, Working length

Figures and Tables

Figure 1

The device for taking a standard radiograph at the same position

Figure 2

Analysis of root canal type

Figure 3

Average working length of initial apical files

Table 1

Average working length of initial apical files (unit: mm)

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

Table 2

Average working length according to the root canal types (Unit: mm)

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

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