Table 2. Mean ± standard deviation of surface roughness (Ra; µm) values for tested interim restorative materials.

	Baseline	30,000 cycles	60,000 cycles
3D printed resin	0.13 ± 0.01Aa	0.48 ± 0.07Ab	0.59 ± 0.06Ac
Milled resin	0.19 ± 0.03Ba	0.88 ± 0.05Bb	1.27 ± 0.49ABb
Conventional resin	0.26 ± 0.02Ca	0.92 ± 0.10Bb	1.64 ± 0.44 Bc

Same superscript letters indicate no statistically significant differences. Uppercase letters for each column, lowercase letters for each row.