Research Article
Influence of Different Beverages on the Color Stability of Nanocomposite Denture Base Materials
Table 4
NBS rating system for expressing the color system.
| NBS units | Remarks on color difference |
| 0.0–0.5 | Trace change | 0.5–1.5 | Slight change | 1.5–3 | Noticeable change | 3–6 | Marked change | 6–12 | Extremely marked change | 12 or more | Change to other colors |
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