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. 2021 May 1;14(9):2352. doi: 10.3390/ma14092352

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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 (https://creativecommons.org/licenses/by/4.0/).

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(a) Non-thermal atmospheric pressure plasma (NTP) treatment on the cube-shaped zirconia block. (b) NTP treatment on the inner surface of the zirconia crown.