Micro-computed tomographic analysis of mandibular second molars with c-shaped root canals

Pablo Andrés Amoroso-Silva, Ronald Ordinola-Zapata, Marco Antonio Hungaro Duarte, James L. Gutmann, Aldo Del Carpio-Perochena, Clovis Monteiro Bramante, Ivaldo Gomes De Moraes

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Introduction The goal of the present study was to evaluate the morphometric aspects of the internal anatomy of the root canal system of mandibular second molars with C-shaped canals. Methods Fifty-two extracted second mandibular molars with C-shaped canals, fused roots, and radicular grooves were selected from a Brazilian population. The samples were scanned with a micro-computed tomographic scanner at a voxel size of 19.6 μm. The root canal cross sections were recorded as C1, C2, C3, and C4 root canal configurations according to the modified Melton classification. Morphometric parameters, including the major and minor diameters of the root canals, the aspect ratio, the roundness, and the tridimensional configuration (merging, symmetric, and asymmetric), were evaluated. Results The 3-dimensional reconstruction images of the teeth indicated an even distribution within the sample. The analysis of the prevalence of the different cross-sectional configurations of the C-shaped molars revealed that these were predominantly of the C4 and C3 configurations (1 mm from the apex) and the C1 and C2 configurations in the cervical third. According to the morphometric parameters, the C1 and the distal aspect of the C2 configurations exhibited the lowest roundness values and higher values for the area, major diameter, and aspect ratio in the apical third. Conclusions Mandibular molars with C-shaped root canals exhibited similar distributions of symmetric, asymmetric, and merging type canals. The C1 configuration and the distal aspect of the C2 configuration exhibited the highest area values, low roundness values, and large apical diameters.

Original languageEnglish (US)
Pages (from-to)890-895
Number of pages6
JournalJournal of Endodontics
Issue number6
StatePublished - Jun 1 2015
Externally publishedYes

Bibliographical note

Funding Information:
Supported by the Brazilian agencies CAPES and FAPESP (grant numbers 2013/03695-0, 2014/03009-1, and 2012/16072-2).

Publisher Copyright:
© 2015 American Association of Endodontists.


  • C-shaped canals
  • dental anatomy
  • fused roots
  • mandibular molars
  • micro-computed tomographic imaging


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