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. 2022 May 30;27(11):3511. doi: 10.3390/molecules27113511

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© 2022 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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Figure A9 — Box-and-whisker plot of Vickers hardness (HV) of Arkon material. Statistically-significant differences were detected between the following: (a,b,c,d,e) Protocol 2 (artificial saliva, 90 days, 37 °C) vs. (a) Protocol 1 (water, 24 h, 37 °C) (p = 0.000000); (b) Protocol 3 (water, 500 thermocycles, 5/55 °C) (p = 0.000000); (c) Protocol 4 (water, 7500 thermocycles, 5/55 °C) (p = 0.000000); (d) Protocol 5 (0.1 M NaOH, 7 days, 60 °C) (p = 0.000002); (e) Protocol 6 (water, 5 days, 55 °C) (p = 0.000000); (f,g,h,i) Protocol 5 (0.1 M NaOH, 7 days, 60 °C) vs. (f) Protocol 1 (water, 24 h, 37 °C) (p = 0.000000); (g) Protocol 3 (water, 500 thermocycles, 5/55 °C) (p = 0.000000); (h) Protocol 4 (water, 7500 thermocycles, 5/55 °C) (p = 0.000000); (i) Protocol 6 (water, 5 days, 55 °C) (p = 0.000000); (j,k,l) Protocol 6 (water, 5 days, 55 °C) vs. (j) Protocol 1 (water, 24 h, 37 °C) (p = 0.021185); Protocol 3 (water, 500 thermocycles, 5/55 °C) (p = 0.016035); (l) Protocol 4 (water, 7500 thermocycles, 5/55 °C) (p = 0.016035).