The canal system in the mesiobuccal root of the maxillary first molar

Dong-Hyun Cho; Ho-Young Choi; Sang-Hyuk Park; Gi-Woon Choi

doi:10.5395/JKACD.2003.28.3.232

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Cho, Choi, Park, and Choi: The canal system in the mesiobuccal root of the maxillary first molar

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2003; 28(3): 232-240.

Published online: 31 May 2003

DOI: https://doi.org/10.5395/JKACD.2003.28.3.232

The canal system in the mesiobuccal root of the maxillary first molar

Dong-Hyun Cho, Ho-Young Choi, Sang-Hyuk Park, Gi-Woon Choi

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

Corresponding author (gwchoi@khu.ac.kr)

(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

This study is to investigate the canal system in the mesiobuccal root of the maxillry first molar.

61 maxillary first molars were randomly selected. Serial transverse sections were made perpendicular to the long axis of the mesiobuccal root. Each section was placed in 3% sodium hypochlorite for 24 hours and rinsed in water and dried. The resected surface was stained with 2% methylene blue dye and examined with stereomicroscope.

Canal configuration analysis showed that 36.1% of the specimen classified as type I, 16.4% as type II, 37.7% as type III and 9.8% as type IV.
Type II canal was merged in one canal within 1 to 4mm of the apex. 40% of type II canal converged at 2mm of the apex.
Type IV canal was divided into two canal within 2 to 4mm of the apex. 66.6% of type IV canal branched off at 2mm of the apex.
None of the sections had more than two main root canal.
48.4% of the sections in 3mm with two canals contained an isthmusand more than 70% with two canals has isthmus at 4 to 5mm sections.

63.9% of the mesiobuccal root of maxillary first molar had two canaland 76.5% of sections with two canals in 5 MM had an isthmus. Because of this complexity the clinician should always search for extra canal carefullyand root canal system, including an isthmus, should be cleaned and shaped completelyand obturated three dimensionally for successful endodontic treatment.

Keywords: Maxillary 1st molar, Mesiobuccal root, Canal system, Extra canal, Canal configuration, Isthmus

Figures and Tables

Fig. 1

Percentage of canals at each level(mm) from the apex.

Fig. 2

Percentage of isthmuses at each level(mm) from the apex.

Fig. 3

Representative photograph of section with Type II root canal at 1.0MM from root apex (original magnification ×20).

Fig. 4

Representative photograph of section with Type II root canal at 2.0MM from root apex (original magnification ×20).

Fig. 5

Representative photograph of section with Type II root canal at 3.0MM from root apex (original magnification ×20).

Fig. 6

Representative photograph of section with Type II root canal at 4.0MM from root apex (original magnification ×20).

Fig. 7

Representative photograph of section with Type IV root canal at 1.0MM from root apex (original magnification ×20).

Fig. 8

Representative photograph of section with Type IV root canal at 2.0MM from root apex (original magnification ×20).

Fig. 9

Representative photograph of section with Type IV root canal at 3.0MM from root apex (original magnification ×20).

Fig. 10

Representative photograph of section with Type IV root canal at 4.0MM from root apex (original magnification ×20).

Fig. 11

Representative photograph of section with no isthmus (original magnification ×16).

Fig. 12

Representative photograph of section with a complete isthmus (original magnification ×16).

Fig. 13

Representative photograph of section with a partial isthmus (original magnification ×16).

Fig. 14

Representative photograph of section with a partial isthmus (original magnification ×16).

Table 1

Canal configurations in the mesiobuccal root of maxillary first molars.(n=61)

Table 2

Level of convergence of type II canals. (n=10)

Table 3

Level of divergence of type IV canals. (n=6)

Table 4

Number of canals at each level(1~6mm). (n=61)

Table 5

Incidence of an isthmus at each level in sections with two canals (1~6mm).

NI, no isthmus; CI, complete isthmus; PI, partial isthmus

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