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A study on the C-shaped root canal system of mandibular second molar
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Original Article A study on the C-shaped root canal system of mandibular second molar
Dong-Gyun Lee, Jun-Mo Park, Ho-Keel Hwang
Journal of Korean Academy of Conservative Dentistry 2007;32(4):335-342.
DOI: https://doi.org/10.5395/JKACD.2007.32.4.335
Published online: July 31, 2007

Department of Conservative Dentistry, Division of Dentistry, Graduate School, Chosun University, Korea.

Corresponding Author: Ho-Keel Hwang. Department of Conservative Dentistry, College of Dentistry, Chosun University, 421 Seosuk-dong, Dong-gu, Gwangju, Korea, 501-825. Tel: 82-62-220-3840, 3847 Fax: 82-62-232-9064, rootcanal@hanmail.net
• Received: March 19, 2007   • Revised: May 1, 2007   • Accepted: May 29, 2007

Copyright © 2007 Korean Academy of Conservative Dentistry

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  • C-shaped canals are known to present a complex canal anatomy with numerous fins connecting individual canals, thus requiring supplementary effort to accomplish a successful root canal treatment. This study examined the frequency of the C-shaped mandibular second molars and interrelation between the clinical records and radiographs to recognize them treated in the Department of Conservative Dentistry of the Chosun University Dental Hospital during a six-year period (1998 - 2004). This study reviewed the clinical records of 227 patients who underwent root canal treatment of the mandibular second molars. After opening the chamber, those cases with C-shaped orifices in the pulpal floor were selected, and the C-shaped root canal types were classified according to Melton's criteria. Three experienced dentists evaluated the radiographs of the C-shaped mandibular second molar on a viewer using a magnifying glass in order to determine if the root apex was fused or separated, the distal root canal was either centered or mesial shifted in the distal root, and if there was bilateral symmetry in a panorama. In conclusion, there is a high frequency of C-shaped mandibular second molars in Koreans. Simultaneous interpretation of the root shape and distal root canal using the preoperative, working length and post-treatment radiographs is important for diagnosing a C-shaped mandibular second molar.
  • Keywords: C-shaped canals; Mandibular second malars; Radiographs; Pulpal floor; Distal root
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Figure 1
Classification of the C-shaped root canal orifice.
jkacd-32-335-g001.jpg
Figure 2
Classification of the C-shaped root shape.
jkacd-32-335-g002.jpg
Figure 3
Classification of the location of the distal root canal in a C-shaped root.
jkacd-32-335-g003.jpg
Figure 4
Bilateral symmetry of the C-shaped root canal.
jkacd-32-335-g004.jpg
Figure 5
Frequency of the C-shaped root canal types.
*: Significantly different at p < 0.01 (χ2 test)
jkacd-32-335-g005.jpg
Figure 6
Root shape of the C-shaped mandibular second molar.
*: Significantly different at p < 0.01 (χ2 test)
jkacd-32-335-g006.jpg
Figure 7
Location of the distal root canal with a C-shaped mandibular second molar.
*: Significantly different at p < 0.01 (χ2 test)
jkacd-32-335-g007.jpg

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        A study on the C-shaped root canal system of mandibular second molar
        J Korean Acad Conserv Dent. 2007;32(4):335-342.   Published online July 31, 2007
        DOI: https://doi.org/10.5395/JKACD.2007.32.4.335
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      A study on the C-shaped root canal system of mandibular second molar
      Image Image Image Image Image Image Image
      Figure 1 Classification of the C-shaped root canal orifice.
      Figure 2 Classification of the C-shaped root shape.
      Figure 3 Classification of the location of the distal root canal in a C-shaped root.
      Figure 4 Bilateral symmetry of the C-shaped root canal.
      Figure 5 Frequency of the C-shaped root canal types. *: Significantly different at p < 0.01 (χ2 test)
      Figure 6 Root shape of the C-shaped mandibular second molar. *: Significantly different at p < 0.01 (χ2 test)
      Figure 7 Location of the distal root canal with a C-shaped mandibular second molar. *: Significantly different at p < 0.01 (χ2 test)

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      A study on the C-shaped root canal system of mandibular second molar
      Restor Dent Endod : Restorative Dentistry & Endodontics
      © The Korean Academy of Conservative Dentistry.
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