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. 2016 Sep 15;6:33421. doi: 10.1038/srep33421

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Surface roughness parameters, Sa (A) and Sz (B), were quantitatively measured at a magnification of 10× with a scanning area of 310 μm × 230 μm, and the results were compared between groups.