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. 2021 Jul 25;51(4):270–281. doi: 10.4041/kjod.2021.51.4.270

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© 2021 The Korean Association of Orthodontists.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Graphical representation of the coefficients of friction (CoFs) for uncoated (CON), alumina (Al₂O₃)-coated (AlO), titanium nitride (TiN)-coated, and chromium nitride (CrN)-coated bracket and nickel–titanium (NiTi) and stainless steel (SS) archwire combinations. Among all groups, the lowest mean CoF value was observed in the AlO coated bracket / AlO coated SS archwire group, whereas the highest mean CoF value was observed in the uncoated bracket / TiN coated SS archwire group.