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. 2017 Jun 12;7:3315. doi: 10.1038/s41598-017-03628-6

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© The Author(s) 2017

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Histologic images at week 12. (a) Periapical areas of the control group stained with haematoxylin and eosin. (b) Periapical areas of the treatment group stained with haematoxylin and eosin. (c and d) High-magnification views of the solid inset in panels a and b, respectively. (e and f) High-magnification views of the dotted insets in panels b and e, respectively, stained with a modified Brown and Brenn method. AF, apical foramen; GP, gutta-percha point; RC, root canal; C, cementum; D, dentin; PL, periapical lesion; arrow head, bacteria; arrow, inflammatory cells.