Sometimes you have some very dark stumps that you cannot block out with even e.max LT. Here is a great solution for you inlab users so you don't have to send these cases out. You can block the dark teeth out with an e.max MO coping and use a more beautiful ceramic with more translucency over the top. Best of both worlds.
This is just a sample case on #7.
You want to avoid using multilayer mode in this instance because it produces too big of a collar and a sprue on the margin. The best practice for this is to do the following:
Step 1: #7, framework mode. Draw the margins short of the actual margin. Mill this out of e.max MO, use finishers to thin out margin and remove undercuts if needed.
Step 2: Place frame on model and reimage. Do a crown drawing margin on actual margins and mill the crown. I would increase the margin thickness parameter to protect the margin and manually polish this back later. In this instance I milled Triluxe 1M2 block
Step 3: Crystallize the frame and stain and glaze the crown, bond them together and you are done.
Great way to help block those endo teeth in the anterior.
Mike Skramstad 
Step 2: Place frame on model and reimage. Do a crown drawing margin on actual margins and mill the crown. I would increase the margin thickness parameter to protect the margin and manually polish this back later. In this instance I milled Triluxe 1M2 block
Step 3: Crystallize the frame and stain and glaze the crown, bond them together and you are done.
Great way to help block those endo teeth in the anterior. 