Table 3.

Surface roughness measurements and color stability results of PEEK material after laboratory and chairside polishing protocols. Kruskall–Wallis test and Mann–Whitney U test: p less than 0.05 and p less than 0.001. There was no statistically significant difference between the polishing protocols represented by the same letters, but a statistically significant difference was found between the groups with different lettering. SD: Standard deviation.

Polishing Protocols (n=15)	Surface Roughness (Ra)		p	∆E00		p
	Mean ± SD	Min-Max (Median)		Mean ± SD	Min-Max (Median)
CN	0.49 ± 0.1	0.37-0.77 (0.47)a	0.001*	4.38 ± 2.03	0.48-7.50 (4.71)a	0.001*
A	0.11 ± 0.03	0.06-0.21 (0.11)b		1.85 ± 1.82	0.21-5.97 (1.3)b
Y	0.16 ± 0.05	0.08-0.25 (0.15)c		4.07 ± 2.10	0.76-8.09 (4.46)a,c
SP	0.45 ± 0.08	0.35-0.73 (0.42)a		2.87 ± 2.32	0.34-9.11 (2.27)b,c
EN	0.29 ± 0.03	0.25-0.38 (0.29)d		1.54 ± 1.52	0.28-6.23 (1.20)b
SS	0.12 ± 0.02	0.09-0.18 (0.12)b,c		3.63 ± 2.19	0.78-8.4 (3.73)a,c