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. 2020 Mar 18;13(6):1376. doi: 10.3390/ma13061376

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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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Line graphs showing ΔE values for the five tested materials after immersion in the different solutions for 2, 4, 6, and 8 weeks: (a) Filtek Z250XT, (b) IPS Empress-Direct, (c) G-ænial, (d) Vit-l-escence, and (e) Ceram.X. Upper case letters indicate statistically significant difference (p < 0.05) overtime for the same material for a given solution. Lower case letters indicate statistically significant difference (p < 0.05) between solutions at a specific time point for a given material.

Line graphs showing ΔE values for the five tested materials after immersion in the different solutions for 2, 4, 6, and 8 weeks: (a) Filtek Z250XT, (b) IPS Empress-Direct, (c) G-ænial, (d) Vit-l-escence, and (e) Ceram.X. Upper case letters indicate statistically significant difference (p < 0.05) overtime for the same material for a given solution. Lower case letters indicate statistically significant difference (p < 0.05) between solutions at a specific time point for a given material.