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. 2020 Jan 9;13(2):307. doi: 10.3390/ma13020307

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© 2020 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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Particles stored for one hour after mixing with monomer, prior to silane treatment, from left to right; impregnated PMMA by silica, silane treated silica (control), untreated TiO₂, ZrO₂, Al₂O₃ and nanoclays 30B and 20A.