The APVolution S is a lithium disilicate reinforced, high strength porcelain. This material is ideal for single crowns, veneers and inlays/onlays up to 3 unit bridges. (400MPa)
Low Translucency or LT
This material shows a more opaque porcelain, which can cover dark stump shades or certain discolorations. 
Indication: In order to get a natural looking crown, the LT ingots can be used for the press/cut back and layering technique. The additional transparent layer, will give the crown the life like appearance, yet the core material will ensure the chroma needed to match the shade.