Shade Selection Calculator

Delta E is calculated as a distance in L*a*b* color space from a fixed A2-equivalent reference point, and Lightness (L*) feeds that distance calculation directly, while Chroma and Hue angle are first converted into a* and b* coordinates before they contribute. Across this calculator's full input ranges, Lightness produces the largest swing in the resulting Delta E figure.

Yes -- they match the 50:50% perceptibility and acceptability thresholds for CIELAB Delta E reported in a multicenter dental color-difference study by Paravina et al. (2015). A Delta E at or below 1.2 is considered imperceptible to the average observer, and at or below 2.7 is considered clinically acceptable even if perceptible.

Yes -- VITA 3D-Master value is bounded to 1 through 5, matching the standard Vitapan 3D-Master system's five lightness groups, where group 1 is the lightest and group 5 the darkest and there is no group 0 in that standard system. A higher Lightness (L*) reading produces a lower group number, since higher L* means a lighter tooth. Note VITA does separately publish a "Bleachedguide 3D-MASTER" product line for bleached/whitened teeth with its own 0M1/0M2/0M3-style numbering -- this calculator implements only the standard 3D-Master 1-5 groups, not the Bleachedguide system.

It only nudges Shade value up by one step once Patient age exceeds 60, reflecting that natural teeth tend to darken and gain chroma with age. It does not change Delta E, VITA shade group, or VITA 3D-Master value, all of which are calculated purely from the L*a*b* readings entered.

Treat it as a rough starting point, not a substitute for comparing against real shade tabs. The actual VITA Classical guide groups by hue family (A/B/C/D) but orders shades within each group by chroma rather than lightness, so a single-input hue-angle approximation can only approximate which letter group a tooth falls into, not the exact tab.