IPS e.max CAD LT Block, Shade A3 Size A16(L) 5/Pk. IPS e.max CAD is a system of lithium disilicate glass-ceramic blocks for CAD/CAM dental restorations using CEREC and inLab systems. A16 block features a special interface for Sirona Ti base. LT (Low Translucency) A16 block optimized for hybrid abutment crowns. Package of 5 blocks