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Morphology of mandibular first molars analyzed by cone-beam computed tomography in a Korean population: variations in the number of roots and canals.
J Endod 2013; 39(12):1516-21JE

Abstract

INTRODUCTION

The aim of this study was to determine the root and canal morphology of the mandibular first molars in a Korean population of Mongolian origin by retrospective analysis of a large number of cone-beam computed tomography (CBCT) images.

METHODS

A total of 976 subjects with bilateral mandibular first molars were examined by using in vivo CBCT methods. The number and configuration of roots, the number of root canals, and the canal configuration based on Vertucci's classification were determined.

RESULTS

Overall, 25.82% of examined molars had 3 roots, 73.51% had 2 roots, and 0.67% had 1 root. The incidence of fourth canal was 50.36%. A right-sided predominance was noted for extra distal roots (P < .001), whereas a left-sided predominance was observed for extra distal canals (P < .001). No significant sex-related differences were shown for their prevalence. The bilateral prevalence rate was 69.13% for extra distal roots and 78.08% for extra distolingual (DL) canals. In the mesial roots, type IV canal was the most frequent (76.86% for 2-rooted molars and 72.96% for 3-rooted molars). In the distal roots, type l was the most common (66.62% for 2-rooted molars and 99.40%-100% for 3-rooted molars). The incidence of 2 canals in distobuccal roots, first reported in this study, was 0.15%.

CONCLUSIONS

Among mandibular first molars, there is a high prevalence of a separate DL root and/or a separate DL canal, and such molars commonly have 4 canals in the Korean population. CBCT is a useful tool for determining root and canal morphology.

Authors+Show Affiliations

Department of Conservative Dentistry, Seoul St Mary's Dental Hospital, Catholic University of Korea, Seoul, Korea.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24238439

Citation

Kim, Sin-Young, et al. "Morphology of Mandibular First Molars Analyzed By Cone-beam Computed Tomography in a Korean Population: Variations in the Number of Roots and Canals." Journal of Endodontics, vol. 39, no. 12, 2013, pp. 1516-21.
Kim SY, Kim BS, Woo J, et al. Morphology of mandibular first molars analyzed by cone-beam computed tomography in a Korean population: variations in the number of roots and canals. J Endod. 2013;39(12):1516-21.
Kim, S. Y., Kim, B. S., Woo, J., & Kim, Y. (2013). Morphology of mandibular first molars analyzed by cone-beam computed tomography in a Korean population: variations in the number of roots and canals. Journal of Endodontics, 39(12), pp. 1516-21. doi:10.1016/j.joen.2013.08.015.
Kim SY, et al. Morphology of Mandibular First Molars Analyzed By Cone-beam Computed Tomography in a Korean Population: Variations in the Number of Roots and Canals. J Endod. 2013;39(12):1516-21. PubMed PMID: 24238439.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Morphology of mandibular first molars analyzed by cone-beam computed tomography in a Korean population: variations in the number of roots and canals. AU - Kim,Sin-Young, AU - Kim,Bom Sahn, AU - Woo,Jein, AU - Kim,Yemi, Y1 - 2013/09/27/ PY - 2013/04/29/received PY - 2013/08/04/revised PY - 2013/08/09/accepted PY - 2013/11/19/entrez PY - 2013/11/19/pubmed PY - 2015/10/17/medline KW - Cone-beam computed tomography KW - Korean KW - distolingual canal KW - distolingual root KW - mandibular first molar KW - root and canal morphology SP - 1516 EP - 21 JF - Journal of endodontics JO - J Endod VL - 39 IS - 12 N2 - INTRODUCTION: The aim of this study was to determine the root and canal morphology of the mandibular first molars in a Korean population of Mongolian origin by retrospective analysis of a large number of cone-beam computed tomography (CBCT) images. METHODS: A total of 976 subjects with bilateral mandibular first molars were examined by using in vivo CBCT methods. The number and configuration of roots, the number of root canals, and the canal configuration based on Vertucci's classification were determined. RESULTS: Overall, 25.82% of examined molars had 3 roots, 73.51% had 2 roots, and 0.67% had 1 root. The incidence of fourth canal was 50.36%. A right-sided predominance was noted for extra distal roots (P < .001), whereas a left-sided predominance was observed for extra distal canals (P < .001). No significant sex-related differences were shown for their prevalence. The bilateral prevalence rate was 69.13% for extra distal roots and 78.08% for extra distolingual (DL) canals. In the mesial roots, type IV canal was the most frequent (76.86% for 2-rooted molars and 72.96% for 3-rooted molars). In the distal roots, type l was the most common (66.62% for 2-rooted molars and 99.40%-100% for 3-rooted molars). The incidence of 2 canals in distobuccal roots, first reported in this study, was 0.15%. CONCLUSIONS: Among mandibular first molars, there is a high prevalence of a separate DL root and/or a separate DL canal, and such molars commonly have 4 canals in the Korean population. CBCT is a useful tool for determining root and canal morphology. SN - 1878-3554 UR - https://www.unboundmedicine.com/medline/citation/24238439/Morphology_of_mandibular_first_molars_analyzed_by_cone_beam_computed_tomography_in_a_Korean_population:_variations_in_the_number_of_roots_and_canals_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0099-2399(13)00725-5 DB - PRIME DP - Unbound Medicine ER -