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. 2020 Feb 3;24:5. doi: 10.1186/s40824-020-0183-9

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© The Author(s). 2020

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 — Histological finding. The implant osseointegration in the rhBMP-2 group was the best. Compared to the implant group, the osseointegration of the implant in the hydrogel group was the worst. The green arrows indicate new formed bone around the implant. Hematoxylin and eosin stain(× 40). Scale bar = 1 mm. I: implant; NB: new bone. a The implant group; b The hydrogel group; c The rhBMP-2 group