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. 2019 Dec 31;20:2. doi: 10.1186/s12903-019-0978-z

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — a and b Blunt root and short root (14, 15, 44, 45), pulp calcification (16, 46), root canal treatment, and apical periodontitis (15) in a 21-year old man. c Root flexion (15) and pulp calcification (16) in a 45-year old woman