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Revista Portuguesa de Estomatologia,
Medicina Dentária e Cirurgia Maxilofacial

rev port estomatol med dent cir maxilofac. 2019;60(3):137-144

Case report

Endodontic treatment of the mandibular first molar
with three distal root canals – Case series

a,
Mariana Domingos Pires *, Jorge N.R. Martins a,b
a Department of Endodontics, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal
b Centro de Estudo de Medicina Dentária Baseada na Evidência, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal

a r t i c l e i n f o a b s t r a c t

Article history: The mandibular first molars may present several anatomic configurations, with the most
Received 24 July 2019 prevalent being the presence of two roots and three root canals. Although the incidence of
Accepted 7 September 2019 three root canals in the distal root is an uncommon occurrence, it must be considered. The
Available online 30 September 2019 present study reports two cases of non-surgical endodontic retreatment and one case of
non-surgical endodontic treatment of mandibular first molars with three distal root canals.
Keywords: A meticulous analysis of the pulp chamber floor, using the dental operating microscope,
Anatomy showed unexpected root canals. Untreated canals that are missed during endodontic pro-
Endodontics cedures are one possible cause for treatment failure. Misinterpretation of the complexity
Molar of the internal anatomy of a tooth subjected to endodontic treatment may lead to subop-
Morphology timal chemo-mechanical debridement, risking the success of the therapy. (Rev Port Esto-
Root canal therapy matol Med Dent Cir Maxilofac. 2019;60(3):137-144)
© 2019 Sociedade Portuguesa de Estomatologia e Medicina Dentária.
Published by SPEMD. This is an open access article under the CC BY-NC-ND license
(http://creativecommons.org/licenses/by-nc-nd/4.0/).

* Corresponding author.
E-mail address: mariana.dpires@gmail.com (Mariana Domingos Pires).
http://doi.org/10.24873/j.rpemd.2019.09.453
1646-2890/© 2019 Sociedade Portuguesa de Estomatologia e Medicina Dentária. Published by SPEMD.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).