Morphologic micro-computed tomography analysis of mandibular premolars with three root canals

Ronald Ordinola-Zapata, Clóvis Monteiro Bramante, Marcelo Haas Villas-Boas, Bruno Cavalini Cavenago, Marco Húngaro Duarte, Marco Aurélio Versiani

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Introduction: This study aimed to describe the anatomy of mandibular premolars with type IX canal configuration by using micro-computed tomography. Methods: Mandibular premolars with radicular grooves (n = 105) were scanned, and 16 teeth with type IX configuration were selected. Number and location of canals, distances between anatomic landmarks, occurrence of apical delta, root canal fusion, and furcation canals, as well as 2-dimensional (area, perimeter, roundness, major and minor diameters) and 3-dimensional (volume, surface area, and structure model index) analysis were performed. Data were statistically compared by using analysis of variance and Kruskal-Wallis tests (α = 0.05). Results: Overall, specimens had 1 root with a main canal that divided into mesiobuccal, distobuccal, and lingual canals at the furcation level. Mean length of the teeth was 22.9 ± 2.06 mm, and the configuration of the pulp chamber was mostly triangle-shaped. Mean distances from the furcation to the apex and cementoenamel junction were 9.14 ± 2.07 and 5.59 ± 2.19 mm, respectively. Apical delta, root canal fusion, and furcation canals were present in 4, 5, and 10 specimens, respectively. No statistical differences were found in the 2-dimensional and 3-dimensional analyses between root canals (P >.05). Conclusions: Type IX configuration of the root canal system was found in 16 of 105 mandibular premolars with radicular grooves. Most of the specimens had a triangle-shaped pulp chamber. Within this anatomic configuration, complexities of the root canal systems such as the presence of furcation canals, fusion of canals, oval-shaped canals in the apical third, small orifices at the pulp chamber level, and apical delta were also observed.

Original languageEnglish (US)
Pages (from-to)1130-1135
Number of pages6
JournalJournal of Endodontics
Issue number9
StatePublished - Sep 2013
Externally publishedYes

Bibliographical note

Funding Information:
Supported by the Brazilian Funding Agency FAPESP grants 2009/09989-0 , 2010/16002-4 , and 2010/16072-2 .

Copyright 2013 Elsevier B.V., All rights reserved.


  • Complex root canal system
  • dental anatomy
  • mandibular premolars
  • micro-computed tomography


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