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. 2018 Jun 14;8:9087. doi: 10.1038/s41598-018-27380-7

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© The Author(s) 2018

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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The tongue-enamel and PDMS-PDMS surfaces. (a) The porcine tongue embedded in the duplicating silicone. (b) The rounded and polished piece of enamel with a radius of curvature of 55 mm fixated in a stainless-steel holder. (c) The stainless-steel flow cell with in the middle the PDMS flat surface. (d) The PDMS pin with a radius of curvature of 3 mm was fixated in a stainless-steel holder that was fitted to the load cell of the testing device.