MEASURING THE WHITENESS OF HUMAN TEETH

This work attempts to determine the best index for measuring the white ness of human teeth. For this the classifications obtained from variou s whiteness indices have been compared, using Spearman's correlation c oefficient, with the responses of 20 observers judging a group of 20 s amples of porcelain teeth. The index which gives the best results is t hat proposed by the CIE, WIC, although the Z% and the CIELAB color dif ference DELTAE are also adequate for measuring the whiteness of human teeth. (C) 1993 John Wiley & Sons, Inc.