VITA Linearguide 3D-Master Shade Guide. The sleek, linear design allows for the quick, reliable, and precise determination of tooth shades, with the same scientific principles found in the VITA 3D-MASTER shade guide. In two simple steps, the final shade is achieved by selecting from five value tabs, then by choosing the correct mix of chroma and hue. The same 29 shade samples found in the VITA Toothguide 3D-MASTER are found in the Linearguide 3D-MASTER. Single shade guide