Polymethylmethacrylate-Based Nanocomposites for Denture Base Fabrication: Impact of Nanoparticle Type and Concentration on the Color Change In Vitro

Table 3

NBS rating system for expressing 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 color