Research Article
Characterization of Esthetic Orthodontic Wires Made from Glass-Fiber-Reinforced Thermoplastic Containing High-Strength, Small-Diameter Glass Fibers
Table 2
National Bureau of Standards (NBS) ratings.
| NBS unit | Critical remarks of color differences |
| 0.0–0.5 | Trace | Extremely slight change | 0.5–1.5 | Slight | Slight change | 1.5–3.0 | Noticeable | Perceivable | 3.0–6.0 | Appreciable | Marked change | 6.0–12.0 | Much | Extremely marked change | 12.0 or more | Very much | Change to other color |
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