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. 2022 Mar 30;55(Suppl 4):892–921. doi: 10.1111/iej.13715

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© 2022 The Authors. International Endodontic Journal published by John Wiley & Sons Ltd on behalf of British Endodontic Society.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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External inflammatory resorption. (a) Mandibular second premolar extracted with the periapical lesion attached. This section, which did not pass through the canal, shows extensive apical resorption (H&E stain; original magnification ×25). (b) Section taken approximately 120 sections away encompasses the apical foramen. In addition to resorption, the opposite phenomenon can be observed; that is, a large calcification partly embedded in the right apical dentin wall (original magnification ×25). (Reprinted from Pathways of the Pulp (12th Edition), Patel S, Durack C, Riccuci D, Bakhash A, Root Resorption, Copyright (2020) with permission from Elsevier)