## 5 Conclusions
Figure 6: Box-and-whisker plot of the diametral tensile strength (DTS) of Arkon after selected aging protocols (control--water, 24 h, 37 \({}^{\circ}\)C; 7 d NaOH--0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; thermocycling + NaOH—water, 7500 thermocycles, 5/55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; 5 d water + NaOH—water, 5 days, 55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C). The following statistically significant differences were detected: (a, b) control vs. (a) thermocycling + NaOH (\(p\) = 0.00022), (b) 7 d NaOH vs. 5 d water + NaOH (\(p\) = 0.00008), (c, d) 7 d NaOH vs. (c) thermocycling + NaOH (\(p\) = 0.00034), and (d) 7 d NaOH vs. 5 d water + NaOH (\(p\) = 0.00012). Figure A9: Box-and-whisker plot of the Vickers hardness (HV) of Arkon after selected aging protocols (control—water, 24 h, 37 \({}^{\circ}\)C; 7 d NaOH—0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; thermocycling + NaOH—water, 7500 thermocycls, 5/55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; 5 d water + NaOH—water, 5 days, 55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C. Significant differences were detected between the following groups: (a, b, c) 7 d NaOH vs. (a) control (\(p\) = 0.000000), (b) thermocycling + NaOH (\(p\) = 0.000000), (c) 5 d water + NaOH (\(p\) = 0.000000), (d, e) thermocycling + NaOH vs. (d) control (\(p\) = 0.00010), and (e) 5 d water + NaOH (\(p\) = 0.00088). Figure 11: Box-and-whisker plot of the fracture toughness (FT) of Flow-Art after selected aging protocols (control—water, 24 h, 37 \({}^{\circ}\)C; 7 d NaOH—0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; thermocycling + NaOH—water, 7500 thermocycles, 5/55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; 5 d water + NaOH—water, 5 days, 55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C). Statistically significant differences were detected between the following groups: (a, b) control vs. (a) thermocycling + NaOH (\(p\) = 0.00004), (b) 5 d water + NaOH (\(p\) = 0.00001), (c, d) 7 d NaOH vs. (c) thermocycling + NaOH (\(p\) = 0.00160), and (d) 5 d water + NaOH (\(p\) = 0.00019). Figure 12: Box-and-whisker plot of the fracture toughness (FT) of Arkon after selected aging protocols (control—water, 24 h, 37 \({}^{\circ}\)C; 7 d NaOH—0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; thermocycling + NaOH—water, 7500 thermocycles, 5/55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; 5 d water + NaOH—water, 5 days, 55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C). The following statistically significant differences were detected: (a, b, c) control vs. (a) 7 d NaOH (\(p\) = 0.00000), (b) thermocycling + NaOH (\(p\) = 0.00000), (c) 5 d water + NaOH (\(p\) = 0.00000), and (d) 7 d NaOH vs. 5 d water + NaOH (\(p\) = 0.01853). Figure 14: Plot of the flexural fatigue limit (FFL) of Flow-Art after selected aging protocols (control—water, 24 h, 37 \({}^{\circ}\)C; 7 d NaOH—0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; thermocycling + NaOH—water, 7500 thermocyles, 5/55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C; 5 d water + NaOH—water, 5 days, 55 \({}^{\circ}\)C and 0.1 M NaOH, 7 days, 60 \({}^{\circ}\)C). The following statistically significant differences were detected: (a, b) control vs. (a) 7 d NaOH (\(p\) = 0.00006), (b) thermocycling + NaOH (\(p\) = 0.00001), (c, d) 5 d water + NaOH vs. (c) 7 d NaOH (\(p\) = 0.01106), and (d) thermocycling + NaOH (\(p\) = 0.00194).