Coincidence between radiographs and clearing samples on the root canal systems of single rooted premolars

Ho-Keel Hwang; Ho-Min Kang; Kang Seo

doi:10.5395/JKACD.2005.30.6.461

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Hwang, Kang, and Seo: Coincidence between radiographs and clearing samples on the root canal systems of single rooted premolars

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2005; 30(6): 461-469.

Published online: 30 November 2005

DOI: https://doi.org/10.5395/JKACD.2005.30.6.461

Coincidence between radiographs and clearing samples on the root canal systems of single rooted premolars

Ho-Keel Hwang, Ho-Min Kang, Kang Seo

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 26 June 2005 Revised 25 August 2005 Accepted 1 September 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 root canal systems of maxillary and mandibular premolars that had a single root using radiographs and clearing samples. 142 single rooted premolars were selected and mesio-distal and bucco-lingual views were radiographed using intra-oral dental standard films. Four equally trained examiners classify the root canal types from the developed radiographs. After opening the tooth for access, it was stored in 5% NaOCl to dissolve the pulp tissue. Indian ink was then injected into the pulp cavity to stain the pulp tissue. It was cleared in methyl salicylate after being decalcified with 5% nitric acid for 48 hours, and the root canal type was evaluated at a magnification of × 20 using a stereomicroscope.

The results are as follows;

There were statistically significant differences between the radiographs and clearing samples of the root canal types among examiners (p < 0.05). There might be differences in the root canal types among examiners when the same radiograph is used. Therefore, considering the difficulty in estimating the root canal types, clinicians need to be careful when interpreting radiographs before root canal therapy.

Keywords: Root canal systems, Clearing samples, Root canal types

Figures and Tables

Figure 1

A paralleling device.

Figure 2

A double exposed radiograph.

Figure 3

Classification of root canal types on radiographs.

Figure 4

Classification of root canal types on clearing samples.

Table 1

Root canal types by interpreted radiographs (%)

^*: Significantly different at p < 0.05 (χ² test)

Table 2

A comparison of root canal types between radiographs and clearing samples

^*: Significantly different at p < 0.05 (χ² test)

Table 3

Coincidence of root canal types between radiographs and clearing samples (%)

Table 4

Coincidence according to the root canal types (%)

○: Correct, ×: Incorrect

Table 5

Coincidence ratio among examiners

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