Fig. 5
Critical marks of color differences according to the National Bureau of standards(NBS). NBS classification:
Trace (0.0–0.5); Slight (0.5–1.5); Noticeable (1.5–3.0); Appreciable (3.0–6.0)
Fig. 5 | BMC Oral Health
Critical marks of color differences according to the National Bureau of standards(NBS). NBS classification:
Trace (0.0–0.5); Slight (0.5–1.5); Noticeable (1.5–3.0); Appreciable (3.0–6.0)