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SEM images of cross sections at 35-times magnification. There was no significant change in the surface of PICN between pre and post artificial brushing, whereas PMMA had a concave planar shape after brushing due to abrasion. The arrows in panel D indicate the concave, worn surface of the PMMA specimen. (A) PICN pre, (B) PICN post, (C) PMMA pre, and (D) PMMA post.
