[Color science in shade determination for ceramometal]

The authors in this study analyse some elements of color science, necessary to an adequate shade choice for ceramo-metal systems. Some light's physical properties, such as reflection, refraction and metamerism, light sources, contrast's effects can determine a change of real color shade. Adoption of some practice devices allows an appropriate porcelain shade selection for give to final crowns a naturalness' character in armony with patient's dentition.