Morphological measurements of two separate mesiobuccal canals in maxillary first molars using micro-computed tomography
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ORIGINAL ARTICLE
Morphological measurements of two separate mesiobuccal canals in maxillary first molars using micro-computed tomography Yeon-Jee Yoo 1 & Jong-Ki Lee 2 & Hiran Perinpanayagam 3 & Soram Oh 4 & Yu Gu 5 & Seok-Woo Chang 4 & Won-Jun Shon 6 & WooCheol Lee 6 & Seung-Ho Baek 6 & Kee-Yeon Kum 6,7 Received: 14 October 2019 / Accepted: 24 February 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Objectives To obtain radicular measurements of two separate mesiobuccal (MB) root canals in maxillary first molars using micro-computed tomography (μCT) with customized software. Materials and methods Human maxillary first molar MB roots (N = 36) with two separate canals (MB1, MB2) and apical foramina were scanned by μCT and analyzed with Kappa2 software to reconstruct three-dimensional (3D) surface models of roots and canals. These models were sectioned at 0.1 mm intervals perpendicular to the central axis of each canal. Canal widths, 3D curvatures, and surrounding dentine thicknesses were measured concurrently on each section. Dentine thicknesses were analyzed statistically for differences between each direction and the different levels of both canals. Results Dentine walls around MB1 were thicker than MB2 (p < 0.05). Thinnest dentine was most often located at disto-inside direction in both canals. Canal widths were significantly smaller in MB2 than MB1 (p < 0.01). Apical constrictions were smaller (p < 0.05) and further (p < 0.05) from the apex in MB2 than MB1. Canal curvatures were greatest in the apical third of both canals (p < 0.001), and they were greater in MB2 than MB1 (p < 0.05). Conclusions MB2 canals had shorter lengths, smaller widths, and more severe curvatures and were surrounded by thinner dentine walls. In MB2, apical constrictions were between 1 and 2 mm from the apex, compared to about 1 mm for MB1. Clinical relevance These detailed measurements and in-depth 3D analyses of maxillary first molar MB roots with two separate canals and apical foramina provide morphologic references for root canal therapy. Keywords Apical constriction . Canal curvature . Canal width . Dentine thickness . Micro-computed tomography . Second mesiobuccal canal
Yeon-Jee Yoo and Jong-Ki Lee equally contributed as first authors Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00784-020-03252-1) contains supplementary material, which is available to authorized users. * Kee-Yeon Kum [email protected] 1
Department of Comprehensive Treatment Center, Dental Research Institute, Seoul National University Dental Hospital, Seoul, Republic of Korea
2
Private Practice, Changwon, Republic of Korea
3
Division of Restorative Dentistry, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Canada
4
Department of Conservative Dentistry, School of Dentistry, Kyung-Hee University, Seoul, Republic of Korea
5
Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University, Jinan, Shandong Provinc
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