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Surface conditions of the specimens, pre- and post-artificial toothbrushing, in SEM images at 1000-times magnification. Surface changes occurred after artificial toothbrushing, with the degree of difference depending on the material. The Rz change in DCF appeared to be the largest, and shallow streaks appeared on the surface of the PMMA specimen. The PICN surface was almost unchanged. (A) PMMA pre, (B) DFC pre, (C) PICN pre, (D) PMMA post, (E) DFC post, and (F) PICN post.
