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. 2019 Aug 6;19:174. doi: 10.1186/s12903-019-0835-0

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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. 4 — (a) Photomicrograph for a sample of subgroup B (MTA) at 2 month showing formation of new layer of dentin like tissue (arrows) on the inner root wall (H&E, X200). (b) Higher magnification of a sample of subgroup A (propolis) showing fibrous connective tissue with islands of cementum like tissue inside the root canal space (H&E, X200)