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. 2021 Mar 26;14(7):1614. doi: 10.3390/ma14071614

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© 2021 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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Surface hardness (VH) mean values of experimental composite resins. The same lower letters indicate that there is no significant difference in surface hardness between experimental composite resins with different weight fractions of HE-Phene in the resin matrix. The same upper letters indicate that there is no significant difference in surface hardness between experimental composite resins with different weight fractions of TE-Phene in the resin matrix. The asterisk * indicates the statistical differences between composites with different Phene like monomers at the same mass fraction in the resin matrix.