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. 2019 Feb 4;9:1252. doi: 10.1038/s41598-018-38137-7

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© The Author(s) 2019

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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Scanning electron microscope images of demineralized dentin surfaces. Samples were immersed in a demineralizing solution of pH 5.0 (A–D) and 10% ethylenediaminetetraacetic acid (EDTA) (E–G) for 3 days each. (A,C,E,G) control group; (B,D,F,H) riboflavin/ultraviolet light (RF/UVA) treated group. The depth of the demineralized zone (black arrow) was clearly larger in the control (A,E) compared to that in the RF/UVA group (B,F). Dentinal tubules in the demineralized zone were enlarged in the control group (C,G), while the demineralization was less aggressive in the RF/UVA group (D,H).