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. 2021 Oct 30;13(21):3761. doi: 10.3390/polym13213761

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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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The Box-and-Whisker plot shows the distribution of color stability of thermocycled and worn zirconia and PEEK crowns. The color stability of thermocycled and worn zirconia was significantly better than that of the PEEK crowns (p < 0.001).