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. 2017 Jul 19;7:5879. doi: 10.1038/s41598-017-05690-6

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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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Images of tooth sample after cracking open the first time and then after breaking tip and SEM micrographs of the interior surface of the tooth sample. (a) Optical image indicating where tip was broken. (b) SEM micrograph of broken tip and indication of imaged face for images (c–f). (c) Image of enamel – dentin interface at 250 X magnification. Scale bar is 100 μm. (d) Image of denting region at 2 KX magnification. Scale bar is 10 μm. (e) Image of dentin region at 5 KX magnification. Scale bar is 1 μm. (f) Image of dentin region at 10 KX magnification. Scale bar is 1 μm.