In days past, dentists simply had to hold a shade tab against their patient’s teeth, write the number down, and pass that data onto the Diverse dental lab. These days, it is no longer sufficient simply to write “A3” on the lab sheet.
Dentists now realize that, while still beneficial, the VITA shade guide tabs do not always indicate the perfect match. Enamel and dentin have distinct characteristics. The correct match is likely to involve not just a single shade but a blend of several shades. A custom coloring, if you will. The precise color match requires more than just mechanically going over a shade chart and checking one option.