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Fig. 5. Scanning electron microscopy images show the frictional wear patterns for uncoated bracket and nickel–titanium (NiTi) archwire (A, B), alumina (Al2O3)-coated bracket and uncoated stainless steel archwire (C, D), titanium nitride (TiN)-coated bracket and uncoated stainless steel archwire (E, F), and chromium nitride (CrN)-coated bracket and CrN-coated NiTi archwire (G, H) pairs. The arrows indicate areas of heavy wear that occurred on the coatings and underlying materials during friction tests.
Korean J Orthod 2021;51:270~281 https://doi.org/10.4041/kjod.2021.51.4.270
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