Micro-CT evaluation of C-shaped mandibular first premolars in a Brazilian subpopulation

R. Ordinola-Zapata, C. Monteiro Bramante, P. Gagliardi Minotti, B. Cavalini Cavenago, J. L. Gutmann, B. I. Moldauer, M. A. Versiani, M. A. Hungaro Duarte

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23 Scopus citations


Aim: To describe morphometric aspects of the internal anatomy of C-shaped mandibular premolars from a Brazilian subpopulation using micro-CT analysis. Methodology: First mandibular premolars with radicular grooves (n = 123) were scanned using a micro-computed tomography system. After cross-section analysis, 83 specimens were identified with a C-shaped canal and selected for micro-CT analysis. Number and location of canals according to Vertucci's classification, distances between anatomic landmarks, occurrence of apical deltas, furcation canals, prevalence of C-shaped cross-sections at five levels as well as 2-dimensional analysis (Area, perimeter, roundness, aspect ratio, major and minor diameters) were performed for the more prevalent anatomical features. Data were compared statistically using Kruskal-Wallis tests (α = 0.05). Results: The more prevalent anatomical types according to Vertucci's classification were Type I (13%), III (8%), V (37%) and VII (2%). Mean distances from the furcation to the cemento-enamel junction were in the range of 5.36-5.65 mm. Apical deltas and furcation canals were present in 36 (43%) and 27 (33%) specimens, respectively. C-shaped cross-sections were more prevalent at the middle (56%) and apical middle levels (81%). Overall, significant differences were found in the 2-dimensional analyses between single canals at the apical third and buccal and lingual canals of Vertucci's V classification (P < 0.05). Conclusions: In this Brazilian subpopulation, C-shaped canal configuration of the root canal system was found in 67% of extracted first mandibular premolars with radicular grooves. Vertucci's types I and V were the most prevalent anatomical variations. C-shaped cross-sections were more prevalent in the middle third, and the presence of apical deltas was the most common feature in the apical third.

Original languageEnglish (US)
Pages (from-to)807-813
Number of pages7
JournalInternational Endodontic Journal
Issue number8
StatePublished - Aug 1 2015
Externally publishedYes


  • C-shaped canal system
  • Dental anatomy
  • Mandibular premolars
  • Micro-computed tomography


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