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. 2017 Jan 20;9(1):33–37. doi: 10.1038/ijos.2016.53

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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Maxillary second molar with a 1-1-1/1 root canal configuration in the palatal and distobuccal roots. This configuration type was found to be the most common (96.7% and 93.5%), respectively) in these roots. The configuration of the mesiobuccal root was 2-2-2/2 with a connecting canal in the middle third. This type of connecting canal could also be considered as an anastomosis; however, in this investigation, it was considered as a connecting canal for the sake of term consistency.