Effect of addition of hemp fiber and lignin-pectin-free hemp fiber to poly(methyl methacrylate) on surface roughness property

Abstract Background: This study aimed to evaluate the effect of hemp fiber (HeF) and lignin-pectin-free HeF addition on the surface roughness of poly(methyl methacrylate) (PMMA) together with the Finishing and Polishing process. Methods: HeF and lignin-pectin-free HeF were used at a rate of 1%. This study uses three groups: Finishing groups (FG), Universal Polishing Paste groups (UP), and Lesk Polishing Liquid groups (LP). Each group has subgroups consisting of PMMA, PMMA + 1% HeF, and PMMA + 1% lignin-pectin-free HeF.