In a shade determination apparatus for teeth and dental restorations, a set of reference templates for comparing to a patient's tooth is provided, whereby based on the coloration of the reference template the shade of a tooth or of a restoration to be employed can be determined. The reference templates...http://www.google.de/patents/US6499998?utm_source=gb-gplus-sharePatent US6499998 - Shade determination apparatus and method for specifying and determining colors for teeth and dental restorations
