Anatomy and Cell Biology

  • 제55권2호
  • /
  • Pages.155-160
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  • 2022
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  • 2093-3665(pISSN)
  • /
  • 2093-3673(eISSN)
대한해부학회 (Korean Association of Anatomists)
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Observation of mandibular second molar roots and root canal morphology using dental cone-beam computed tomography

  • Ryohei Shigefuji (Department of Morphological Biology, Ohu University School of Dentistry) ;
  • Masamitsu Serikawa (Department of Morphological Biology, Ohu University School of Dentistry) ;
  • Akinobu Usami (Department of Morphological Biology, Ohu University School of Dentistry)
  • 투고 : 2022.03.04
  • 심사 : 2022.03.24
  • 발행 : 2022.06.30
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초록

The mandibular second molars show various morphological features in the roots and root canal, and a gutter-shaped root (GSR) caused by fusion of the mesial and distal roots is frequently encountered. In this study the number of the roots associated with mandibular second molars were observed using dental cone-beam computed tomography (CBCT). For those with a GSR, determination of root morphology and root canal classification were performed. CBCT image data from 173 Japanese mandibular second molars were obtained. Using sliced images, the number of the roots and root morphology were determined. In cases with a GSR, the ratio for the fused roots was determined and root canal morphology features were classified. A GSR was found in 61 (35.3%), with greater prevalence in females. In addition, the overall ratio of the fused part to root thickness in those with a GSR was 48.7%, with no significant difference related to sex. Furthermore, a C-shaped root canal morphology was commonly observed in both males and females with a GSR. In the present cohort examined in Japanese, most of the mandibular second molar were found to have two roots, with a GSR noted in 35.5%. While a GSR was more often observed in females, a C-shaped root canal was the most common root canal morphology in both sexs. It is considered that assessment using CBCT findings is helpful for precise determination of root canal morphology and presence of a GSR in mandibular second molars.

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참고문헌

  1. Zare Jahromi M, Jafari Golestan F, Mashhadi Esmaeil M, Moouavizahed Sh, Sarami M. Root and canal morphology of mandibular second molar in an Iranian population by clearing method. J Dent (Shiraz) 2013;14:78-81.
  2. Neelakantan P, Subbarao C, Subbarao CV, Ravindranath M. Root and canal morphology of mandibular second molars in an Indian population. J Endod 2010;36:1319-22. https://doi.org/10.1016/j.joen.2010.04.001
  3. Gulabivala K, Opasanon A, Ng YL, Alavi A. Root and canal morphology of Thai mandibular molars. Int Endod J 2002;35:56-62. https://doi.org/10.1046/j.1365-2591.2002.00452.x
  4. Peiris R, Takahashi M, Sasaki K, Kanazawa E. Root and canal morphology of permanent mandibular molars in a Sri Lankan population. Odontology 2007;95:16-23. https://doi.org/10.1007/s10266-007-0074-8
  5. Singh S, Pawar M, Podar R, Kulkarni G, Bhanushali N. Root canal morphology of South Asian Indian mandibular first, second, and third molar: a dye penetration and clearing study. J Conserv Dent 2020;23:284-8. https://doi.org/10.4103/JCD.JCD_379_20
  6. Melton DC, Krell KV, Fuller MW. Anatomical and histological features of C-shaped canals in mandibular second molars. J Endod 1991;17:384-8.
  7. Manning SA. Root canal anatomy of mandibular second molars. Part I. Int Endod J 1990;23:34-9. https://doi.org/10.1111/j.1365-2591.1990.tb00800.x
  8. Song JS, Choi HJ, Jung IY, Jung HS, Kim SO. The prevalence and morphologic classification of distolingual roots in the mandibular molars in a Korean population. J Endod 2010;36:653-7.
  9. Kim SY, Kim BS, Kim Y. Mandibular second molar root canal morphology and variants in a Korean subpopulation. Int Endod J 2016;49:136-44. https://doi.org/10.1111/iej.12437
  10. Helvacioglu-Yigit D, Sinanoglu A. Use of cone-beam computed tomography to evaluate C-shaped root canal systems in mandibular second molars in a Turkish subpopulation: a retrospective study. Int Endod J 2013;46:1032-8. https://doi.org/10.1111/iej.12094
  11. Zheng Q, Zhang L, Zhou X, Wang Q, Wang Y, Tang L, Song F, Huang D. C-shaped root canal system in mandibular second molars in a Chinese population evaluated by cone-beam computed tomography. Int Endod J 2011;44:857-62. https://doi.org/10.1111/j.1365-2591.2011.01896.x
  12. Katakami K, Mishima A, Shiozaki K, Shimoda S, Hamada Y, Kobayashi K. Characteristics of accessory mental foramina observed on limited cone-beam computed tomography images. J Endod 2008;34:1441-5. https://doi.org/10.1016/j.joen.2008.08.033
  13. Kim SY, Yang SE. Cone-beam computed tomography study of incidence of distolingual root and distance from distolingual canal to buccal cortical bone of mandibular first molars in a Korean population. J Endod 2012;38:301-4. https://doi.org/10.1016/j.joen.2011.10.023
  14. Vizzotto MB, Silveira PF, Arus NA, Montagner F, Gomes BP, da Silveira HE. CBCT for the assessment of second mesiobuccal (MB2) canals in maxillary molar teeth: effect of voxel size and presence of root filling. Int Endod J 2013;46:870-6. https://doi.org/10.1111/iej.12075
  15. Blattner TC, George N, Lee CC, Kumar V, Yelton CD. Efficacy of cone-beam computed tomography as a modality to accurately identify the presence of second mesiobuccal canals in maxillary first and second molars: a pilot study. J Endod 2010;36:867-70. https://doi.org/10.1016/j.joen.2009.12.023
  16. Morikage N, Hamada T, Usami A, Takada S. Topographical relationship between positions of lingual foramina and attachment of mylohyoid muscle in mental region. Surg Radiol Anat 2017;39:735-9. https://doi.org/10.1007/s00276-016-1804-9
  17. Yoza T, Serikawa M, Sugita T, Harada T, Usami A. Cone-beam computed tomography observation of maxillary first premolar canal shapes. Anat Cell Biol 2021;54:424-30. https://doi.org/10.5115/acb.21.110
  18. Suzuki M, Tsujimoto Y, Kondo S. Morphological variations of the root canal system in C-shaped roots of the mandibular second molar in a Japanese population. Int J Oral-Med Sci 2015;13:81-8. https://doi.org/10.5466/ijoms.13.81
  19. Carlsen O, Alexandersen V. Radix entomolaris: identification and morphology. Scand J Dent Res 1990;98:363-73.
  20. Chandra SS, Chandra S, Shankar P, Indira R. Prevalence of radix entomolaris in mandibular permanent first molars: a study in a South Indian population. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011;112:e77-82. https://doi.org/10.1016/j.tripleo.2011.02.016
  21. Kato A, Hishikawa T, Inagaki K, Yamamoto G, Mitani A, Honda M. Evaluation of root morphology of maxillary and mandibular second molars lost due to periodontitis. J Periodontal Res 2020;55:753-61.
  22. Fan B, Cheung GS, Fan M, Gutmann JL, Bian Z. C-shaped canal system in mandibular second molars: Part I--Anatomical features. J Endod 2004;30:899-903. https://doi.org/10.1097/01.don.0000136207.12204.e4
  23. Schneider CA, Rasband WS, Eliceiri KW. NIH Image to ImageJ: 25 years of image analysis. Nat Methods 2012;9:671-5. https://doi.org/10.1038/nmeth.2089
  24. Kondo S, Yamada H, Kanazawa E. Metrical studies of the crown components of the Japanese mandibular molars. Anthropol Sci 2001;109:213-23. https://doi.org/10.1537/ase.109.213
  25. Special Committee to Revise the Joint AAE/AAOMR Position Statement on use of CBCT in Endodontics. AAE and AAOMR joint position statement: use of cone beam computed tomography in endodontics 2015 update. Oral Surg Oral Med Oral Pathol Oral Radiol 2015;120:508-12. https://doi.org/10.1016/j.oooo.2015.07.033
  26. George R, Rutley EB, Walsh LJ. Evaluation of smear layer: a comparison of automated image analysis versus expert observers. J Endod 2008;34:999-1002. https://doi.org/10.1016/j.joen.2008.05.003
  27. Barsness SA, Bowles WR, Fok A, McClanahan SB, Harris SP. An anatomical investigation of the mandibular second molar using micro-computed tomography. Surg Radiol Anat 2015;37:267-72. https://doi.org/10.1007/s00276-014-1364-9
  28. Haddad GY, Nehme WB, Ounsi HF. Diagnosis, classification, and frequency of C-shaped canals in mandibular second molars in the Lebanese population. J Endod 1999;25:268-71. https://doi.org/10.1016/S0099-2399(99)80157-5