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Morphological Characteristics and Classification of Mandibular First Molars Having 2 Distal Roots or Canals: 3-Dimensional Biometric Analysis Using Cone-beam Computed Tomography in a Korean Population.
J Endod 2018; 44(1):46-50JE

Abstract

INTRODUCTION

The aim of this study was to determine the morphologic characteristics of mandibular first molars having 2 canals in distal roots. Interorifice distance, buccal bone thickness, and root curvature were evaluated using cone-beam computed tomography images in a Korean population.

METHODS

In total, 1958 mandibular first molars were evaluated in axial, coronal, sagittal, and paraxial planes. Distal roots having 2 canals were classified according to their root and canal shapes (2 roots, 2 canals [2R2C]; 1 root, 2 canals with 2 apical foramina [1R2C(2-2)]; and 1 root, 2 canals with 1 apical foramen [1R2C(2-1)]). The distances between orifices and the distance from the apex to the buccal bone plate were measured for each root canal shape (2R2C, 1R2C[2-2], and 1R2C[2-1]). The curvature of distolingual (DL) roots was classified according to severity using 3-dimensional reconstructed images, and the direction of curvature was determined. The relationships of these characteristics to sex and side were evaluated.

RESULTS

The prevalences of 2R2C, 1R2C(2-2), and 1R2C(2-1) were 25.89%, 10.32%, and 14.15%, respectively. The distances between distobuccal (DB) and DL orifices were 3.77 ± 0.74 mm for 2R2C, 3.02 ± 0.65 mm for 1R2C(2-2), and 2.44 ± 0.64 mm for 1R2C(2-1). The distances from the buccal plate to the DB canal were 3.84 ± 1.35 mm for 2R2C, 5.33 ± 1.41 mm for 1R2C(2-2), and 5.96 ± 1.63 mm for 1R2C(2-1). The distance from the buccal plate to the DL canal was 9.85 ± 1.46 mm for 2R2C, and 8.28 ± 1.50 mm for 1R2C(2-2). All distances differed significantly according to root canal configurations, and all were greater in men than women (P < .05), except for the DB-DL orifice distance in 1R2C(2-2) and the DB to buccal cortical plate distance in all root configurations (P > .05). No significant difference between the left and right sides was found (P > .05). The prevalence of most severely curved DL roots (type III) was 62.92%, and the direction was commonly toward the buccal side (69.03%).

CONCLUSIONS

The prevalence of mandibular first molars having 2 canals in distal roots was more than 50% in a Korean population. Interorifice distances between DB and DL canals and distances from the apex to the buccal cortical plate differed according to root and canal numbers and shapes.

Authors+Show Affiliations

Department of Conservative Dentistry, Ewha Womans University School of Medicine, Seoul, Korea. Electronic address: yemis@ewha.ac.kr.Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea.Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea.Department of Radiology, Ewha Womans University School of Medicine, Seoul, Korea.Department of Conservative Dentistry, Ewha Womans University School of Medicine, Seoul, Korea.Department of Conservative Dentistry, Ewha Womans University School of Medicine, Seoul, Korea.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29033084

Citation

Kim, Yemi, et al. "Morphological Characteristics and Classification of Mandibular First Molars Having 2 Distal Roots or Canals: 3-Dimensional Biometric Analysis Using Cone-beam Computed Tomography in a Korean Population." Journal of Endodontics, vol. 44, no. 1, 2018, pp. 46-50.
Kim Y, Roh BD, Shin Y, et al. Morphological Characteristics and Classification of Mandibular First Molars Having 2 Distal Roots or Canals: 3-Dimensional Biometric Analysis Using Cone-beam Computed Tomography in a Korean Population. J Endod. 2018;44(1):46-50.
Kim, Y., Roh, B. D., Shin, Y., Kim, B. S., Choi, Y. L., & Ha, A. (2018). Morphological Characteristics and Classification of Mandibular First Molars Having 2 Distal Roots or Canals: 3-Dimensional Biometric Analysis Using Cone-beam Computed Tomography in a Korean Population. Journal of Endodontics, 44(1), pp. 46-50. doi:10.1016/j.joen.2017.08.005.
Kim Y, et al. Morphological Characteristics and Classification of Mandibular First Molars Having 2 Distal Roots or Canals: 3-Dimensional Biometric Analysis Using Cone-beam Computed Tomography in a Korean Population. J Endod. 2018;44(1):46-50. PubMed PMID: 29033084.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Morphological Characteristics and Classification of Mandibular First Molars Having 2 Distal Roots or Canals: 3-Dimensional Biometric Analysis Using Cone-beam Computed Tomography in a Korean Population. AU - Kim,Yemi, AU - Roh,Byoung-Duck, AU - Shin,Yooseok, AU - Kim,Bom Sahn, AU - Choi,Yoo-Lim, AU - Ha,Aena, Y1 - 2017/10/21/ PY - 2016/07/11/received PY - 2017/03/02/revised PY - 2017/08/02/accepted PY - 2017/10/17/pubmed PY - 2018/11/6/medline PY - 2017/10/17/entrez KW - Buccal bone thickness KW - Korean KW - cone-beam computed tomography KW - distolingual root KW - interorifice distance KW - mandibular first molar KW - root curvature SP - 46 EP - 50 JF - Journal of endodontics JO - J Endod VL - 44 IS - 1 N2 - INTRODUCTION: The aim of this study was to determine the morphologic characteristics of mandibular first molars having 2 canals in distal roots. Interorifice distance, buccal bone thickness, and root curvature were evaluated using cone-beam computed tomography images in a Korean population. METHODS: In total, 1958 mandibular first molars were evaluated in axial, coronal, sagittal, and paraxial planes. Distal roots having 2 canals were classified according to their root and canal shapes (2 roots, 2 canals [2R2C]; 1 root, 2 canals with 2 apical foramina [1R2C(2-2)]; and 1 root, 2 canals with 1 apical foramen [1R2C(2-1)]). The distances between orifices and the distance from the apex to the buccal bone plate were measured for each root canal shape (2R2C, 1R2C[2-2], and 1R2C[2-1]). The curvature of distolingual (DL) roots was classified according to severity using 3-dimensional reconstructed images, and the direction of curvature was determined. The relationships of these characteristics to sex and side were evaluated. RESULTS: The prevalences of 2R2C, 1R2C(2-2), and 1R2C(2-1) were 25.89%, 10.32%, and 14.15%, respectively. The distances between distobuccal (DB) and DL orifices were 3.77 ± 0.74 mm for 2R2C, 3.02 ± 0.65 mm for 1R2C(2-2), and 2.44 ± 0.64 mm for 1R2C(2-1). The distances from the buccal plate to the DB canal were 3.84 ± 1.35 mm for 2R2C, 5.33 ± 1.41 mm for 1R2C(2-2), and 5.96 ± 1.63 mm for 1R2C(2-1). The distance from the buccal plate to the DL canal was 9.85 ± 1.46 mm for 2R2C, and 8.28 ± 1.50 mm for 1R2C(2-2). All distances differed significantly according to root canal configurations, and all were greater in men than women (P < .05), except for the DB-DL orifice distance in 1R2C(2-2) and the DB to buccal cortical plate distance in all root configurations (P > .05). No significant difference between the left and right sides was found (P > .05). The prevalence of most severely curved DL roots (type III) was 62.92%, and the direction was commonly toward the buccal side (69.03%). CONCLUSIONS: The prevalence of mandibular first molars having 2 canals in distal roots was more than 50% in a Korean population. Interorifice distances between DB and DL canals and distances from the apex to the buccal cortical plate differed according to root and canal numbers and shapes. SN - 1878-3554 UR - https://www.unboundmedicine.com/medline/citation/29033084/Morphological_Characteristics_and_Classification_of_Mandibular_First_Molars_Having_2_Distal_Roots_or_Canals:_3_Dimensional_Biometric_Analysis_Using_Cone_beam_Computed_Tomography_in_a_Korean_Population_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0099-2399(17)30948-2 DB - PRIME DP - Unbound Medicine ER -