We have been scanning for a while now and constantly run into this same issue. For most cases we mount on a plastic vertex articulator, which works fine for scanning. Some cases need to be mounted on a metal hinge type articulator which seems to be too big to fit in our scanner. Currently our solution is to gently knock the case off, after making a silicone matrix to hold the case in the proper bite relationship during scanning. After scanning we glue the case back on the articulator using our matrix and the bite as reference.
We use a 3shape D800 and D700.
Does anyone have a better solution or suggestion for scanning cases mounted on a metal articulator?