From exocad documentation
To define a bite splint case in the DentalDB, click on the tooth  and in the window that pops up, left-click on Bite splint. If the area is edentulous, choose Bite splint(missing tooth) . See section "Defining jobs for individual teeth" for details.
Define the type of antagonist scan by using the pull-down menu and choosing the appropriate one: Bite impression (unlikely to be useful for bite splints), Registered jaw (without articulation), Type A or Type S. See section "Getting Started" for details.