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Surface roughness (Sa) average values for each material group and cleaning protocol presented in micrometers (µm) as averages +/− standard deviations.
Statistically significant (Kruskal–Wallis and pairwise Wilcoxon, p-adjusted < 0.05) differences comparing material group means within each cleaning protocol are marked with a bracketed notation on the respective side of the table. CCP—Conventional cleaning protocol; RCP—Research cleaning protocol.
