IPS Empress CAD - LT Block, Shade B1 Size C14, 5/Pk. IPS Empress CAD is a system of composite (leucite-based) ceramic blocks that are commonly used for CAD/CAM dental restorations using CEREC and inLab systems. LT blocks feature a lower degree of translucency, making them ideal for most full coverage restorations (e.g., full crowns, large partial coverage restorations and veneers). Package of 5 blocks