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. 2019 Aug 4;20(15):3811. doi: 10.3390/ijms20153811

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Atomic force microscopy (AFM) images of peek specimens (A) P and (B) SP. Three-dimensional fluctuating images of peek specimens (C) P and (D) SP for comparison of the surface roughness. * p < 0.05.