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Morphological measurements of two separate mesiobuccal canals in maxillary first molars using micro-computed tomography

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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.

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Funding

This study was supported by Seoul National University Dental Hospital Research Fund [08-2019-0001], and the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI) and the Ministry of Health & Welfare (HI17C1377).

Author information

Author notes

  1. Yeon-Jee Yoo and Jong-Ki Lee equally contributed as first authors

Authors and Affiliations

  1. Department of Comprehensive Treatment Center, Dental Research Institute, Seoul National University Dental Hospital, Seoul, Republic of Korea

    Yeon-Jee Yoo

  2. Private Practice, Changwon, Republic of Korea

    Jong-Ki Lee

  3. Division of Restorative Dentistry, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Canada

    Hiran Perinpanayagam

  4. Department of Conservative Dentistry, School of Dentistry, Kyung-Hee University, Seoul, Republic of Korea

    Soram Oh & Seok-Woo Chang

  5. Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University, Jinan, Shandong Province, China

    Yu Gu

  6. Department of Conservative Dentistry, Dental Research Institute, Seoul National University School of Dentistry, Seoul, Republic of Korea

    Won-Jun Shon, WooCheol Lee, Seung-Ho Baek & Kee-Yeon Kum

  7. National Dental Care Center for Persons with Special Cares, Seoul, Republic of Korea

    Kee-Yeon Kum

Authors
  1. Yeon-Jee Yoo
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  5. Yu Gu
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  8. WooCheol Lee
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  9. Seung-Ho Baek
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  10. Kee-Yeon Kum
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Contributions

Conceptualization: Kee-Yeon Kum; data curation: Jong-Ki Lee, Yeon-Jee Yoo, and Kee-Yeon Kum; formal analysis: Soram Oh and Yu Gu; investigation: Yeon-Jee Yoo, Jong-Ki Lee, and Kee-Yeon Kum; methodology: Seok-Woo Chang and Won-Jun Shon; resources: Yeon-Jee Yoo and Kee-Yeon Kum; software: Jong-Ki Lee; funding: Yeon-Jee Yoo and Kee-Yeon Kum; supervision: Kee-Yeon Kum; validation: Hiran Perinpanayagam, WooCheol Lee, and Seung-Ho Baek; visualization: Jong-Ki Lee; writing and original draft preparation: Yeon-Jee Yoo; writing, review, and editing: Hiran Perinpanayagam, WooCheol Lee, and Kee-Yeon Kum. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Kee-Yeon Kum.

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Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical approval

Study approval was obtained from the Institutional Review Board of Seoul National University Dental Hospital (ERI 12006).

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For this type of study, formal consent is not required.

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Yoo, YJ., Lee, JK., Perinpanayagam, H. et al. Morphological measurements of two separate mesiobuccal canals in maxillary first molars using micro-computed tomography. Clin Oral Invest 24, 3863–3870 (2020). https://doi.org/10.1007/s00784-020-03252-1

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  • DOI: https://doi.org/10.1007/s00784-020-03252-1

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