pISSN 2234-7518
eISSN 2005-372X

Table. 2.

Surface roughness parameters for uncoated and coated brackets and nickel–titanium (NiTi) and stainless steel archwires

Brackets and arch wires Coating material Measuring range
(µm)
Roughness parameters
Arithmetic average roughness (Ra)
(nm)
Root mean square
roughness (Rq)
(nm)
Total height of
profile (Rt)
(µm)
Bracket slot base Uncoated 250 × 250 459.17 564.85 3.82
Al2O3 250 × 250 331.53 426.17 3.93
TiN 250 × 250 354.12 458.74 4.22
CrN 250 × 250 276.85 360.34 2.94
Heat-activated NiTi arch wire
(0.016-inch round)
Uncoated 250 × 500 439.34 564.88 5.74
Al2O3 250 × 500 361.64 466.01 3.78
TiN 250 × 500 391.99 534.36 6.66
CrN 250 × 500 354.35 454.66 6.21
Stainless steel arch wire
(0.019 × 0.025-inch rectangular)
Uncoated 250 × 500 234.44 268.25 2.13
Al2O3 250 × 500 95.86 128.01 1.74
TiN 250 × 500 105.15 132.67 1.25
CrN 250 × 500 190.28 229.26 1.51

Al2O3, alumina; TiN, titanium nitride; CrN, chromium nitride.

Korean J Orthod 2021;51:270~281 https://doi.org/10.4041/kjod.2021.51.4.270
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