37
VITA Easyshade
®
Advance 4.0
Appendix
Spectrophotometer
VITA SYSTEM 3D-MASTER shades
VITA classical A1–D4 shades
Value
Chroma
Hue
Mixed shades
CIE L*a*b*
An instrument for color measurement that measures the spectral distribution
of light and converts it into color values (tristimulus value) or an internationally
accepted numerical form.
Refers to the 29 shade sample teeth including 3 Bleached Shade Guide
and the 52 VITA SYSTEM 3D-MASTER mixed shades.
Refers to the 16 original VITA classical A1–D4 shades found on the VITA classical
A1–D4 shade guide, which was originally called the Lumin Vacuum shade guide.
The luminance of the color. It is the lightness or darkness of a color relative
to a series of grays ranging from white (L = 100) to black (L = 0).
The saturation (intensity) of a color. It is the difference between the color
and a gray having the same brightness, measured as the distance from the
neutral axis. It is sometimes referred to as the purity of the color.
What we commonly call color (red, yellow, green, blue or some other color).
It corresponds to the physical wavelength of light. In the L*C*h* system it is
represented as an angle ranging from 0° to 360°. Angles that range from 0° to 90°
are reds, oranges and yellows; 90° to 180° are yellows, yellow-greens and greens;
180° to 270° are greens, cyans (blue-greens) and blues; 270° to 360° are blues,
purples and magentas, returning again to red at 360° (the same as 0°).
The mixture of two or more shades of porcelain to achieve an intermediate shade.
For example, 2M2 can be mixed with 2M3 to achieve the shade 2M2.5.
A three-coordinate representation of color (tristimulus) in color space, defined
by the International Commission on Illumination (Commission Internationale
d'Eclairage). For additional information on color theory visit VITA's website at
www.vita-zahnfabrik.com
12.6 Glossary