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. 2021 Mar 20;109(2):121–131. doi: 10.1007/s00223-021-00835-2

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Classification of dens invaginatus (Oehlers [17]). A schematic drawing showing the types of invagination according to Oehlers [17]. Type I: an invagination into the crown only. Type II: an invagination into the root that ends in a blind sac. Type III: an invagination that penetrates the root and bursts apically or laterally into a foramen (From Ahmed and Dummer 2017,

reproduced with permission from Wiley). b Dens evaginatus. A radiograph and a schematic drawing of a second lower premolar showing an extra cusp (arrow) with the pulp extending into it