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Tangential fretting features. a) Schematic diagram of tangential fretting in the dental implant/cortical bone interface and fretting test on materials. b) 2D and c) 3D maps of wear scars (D = 50 µm), and d) the corresponding friction log (F t–D–N curves). e) Energy ratio (E d/E t) analysis. f) The depth profiles of wear scars. g) The coefficient of friction (CoF) of the materials.
