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. 2020 Nov 16;10:19884. doi: 10.1038/s41598-020-77035-9

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© The Author(s) 2020

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 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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SEM (scanning electron microscope) images showing the surfaces of sound and demineralized dentin specimens treated with different materials, before and after brushing procedures. Before brushing: (a) control sound dentin, (b) control demineralized dentin, (c) SDF-treated sound dentin, (d) SDF-treated demineralized dentin, (e) SDF + KI-treated sound dentin, (f) SDF + KI-treated demineralized dentin. After brushing: (g) control sound dentin, (h) control demineralized dentin, (i) SDF-treated sound dentin, (j) SDF-treated demineralized dentin, (k) SDF + KI-treated sound dentin, (l) SDF + KI-treated demineralized dentin.