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Crystallite removal and individual debris on the enamel surface after one cycle of wear by a SiO2 microsphere under the contact pressure of 0.74 GPa. Particles with diameters of ∼60 nm to ∼80 nm are hydroxyapatite crystallites on the enamel surface. (A) AFM image of the original surface before wear. (B) In situ AFM image of the worn surface.
