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Mandibular second molar root canal morphology and variants in a Korean subpopulation.
Int Endod J. 2016 Feb; 49(2):136-44.IE

Abstract

AIM

To determine the root canal anatomy of mandibular second molars in a Korean population by analysing cone-beam computed tomography (CBCT) images.

METHODOLOGY

The CBCT images of 960 subjects were examined. The number and configuration of roots and canals were categorized according to Vertucci's and modified Melton's classifications.

RESULTS

Of the 1920 mandibular second molars, 41% had one root, 58% had two roots, and <1% had three roots. In the mesial roots of two-rooted molars, Vertucci's Type lV (44%) and Type II (37.75%) canals were most frequent. The prevalence of C-shaped roots was 40%, and C-shaped roots in combination with additional mesiolingual or distolingual roots were found in <1% of molars. Interestingly, O-shaped canals were detected in 0.10% of the molars. Of the C-shaped roots, the most common configuration types were Melton's Type I (66%) in the coronal region and Melton's Type III (56%) in the apical region. The prevalence of C-shaped roots was higher in females (47%) than in males (32%) (P < 0.001) and did not differ with age (P = 0.497) or tooth position (P = 0.514). Most (82%) C-shaped canals were bilateral (P < 0.001).

CONCLUSIONS

A high prevalence of C-shaped canals and a low incidence of three-rooted molars were observed in the mandibular second molars of the Korean subpopulation studied.

Authors+Show Affiliations

Department of Conservative Dentistry, Seoul St. Mary's Dental Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.Department of Radiology, Ewha Womans University School of Medicine, Seoul, Korea.Department of Conservative Dentistry, Dental Research Institute, Ewha Womans University School of Medicine, Seoul, Korea.

Pub Type(s)

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

Language

eng

PubMed ID

25652228

Citation

Kim, S Y., et al. "Mandibular Second Molar Root Canal Morphology and Variants in a Korean Subpopulation." International Endodontic Journal, vol. 49, no. 2, 2016, pp. 136-44.
Kim SY, Kim BS, Kim Y. Mandibular second molar root canal morphology and variants in a Korean subpopulation. Int Endod J. 2016;49(2):136-44.
Kim, S. Y., Kim, B. S., & Kim, Y. (2016). Mandibular second molar root canal morphology and variants in a Korean subpopulation. International Endodontic Journal, 49(2), 136-44. https://doi.org/10.1111/iej.12437
Kim SY, Kim BS, Kim Y. Mandibular Second Molar Root Canal Morphology and Variants in a Korean Subpopulation. Int Endod J. 2016;49(2):136-44. PubMed PMID: 25652228.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mandibular second molar root canal morphology and variants in a Korean subpopulation. AU - Kim,S Y, AU - Kim,B S, AU - Kim,Y, Y1 - 2015/03/11/ PY - 2014/11/01/received PY - 2015/01/30/accepted PY - 2015/2/6/entrez PY - 2015/2/6/pubmed PY - 2017/5/23/medline KW - C-shaped canal KW - Korean KW - O-shaped canal KW - cone-beam computed tomography KW - mandibular second molar KW - root and canal morphology SP - 136 EP - 44 JF - International endodontic journal JO - Int Endod J VL - 49 IS - 2 N2 - AIM: To determine the root canal anatomy of mandibular second molars in a Korean population by analysing cone-beam computed tomography (CBCT) images. METHODOLOGY: The CBCT images of 960 subjects were examined. The number and configuration of roots and canals were categorized according to Vertucci's and modified Melton's classifications. RESULTS: Of the 1920 mandibular second molars, 41% had one root, 58% had two roots, and <1% had three roots. In the mesial roots of two-rooted molars, Vertucci's Type lV (44%) and Type II (37.75%) canals were most frequent. The prevalence of C-shaped roots was 40%, and C-shaped roots in combination with additional mesiolingual or distolingual roots were found in <1% of molars. Interestingly, O-shaped canals were detected in 0.10% of the molars. Of the C-shaped roots, the most common configuration types were Melton's Type I (66%) in the coronal region and Melton's Type III (56%) in the apical region. The prevalence of C-shaped roots was higher in females (47%) than in males (32%) (P < 0.001) and did not differ with age (P = 0.497) or tooth position (P = 0.514). Most (82%) C-shaped canals were bilateral (P < 0.001). CONCLUSIONS: A high prevalence of C-shaped canals and a low incidence of three-rooted molars were observed in the mandibular second molars of the Korean subpopulation studied. SN - 1365-2591 UR - https://www.unboundmedicine.com/medline/citation/25652228/Mandibular_second_molar_root_canal_morphology_and_variants_in_a_Korean_subpopulation_ L2 - https://doi.org/10.1111/iej.12437 DB - PRIME DP - Unbound Medicine ER -