Ivoclar Vivadent IPS e.max CAD-on - Manual (Page 20)

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Note on the optimum selection of the insertion axis:
An inadequate insertion axis selection (see image: model is inclined
too far to the buccal aspect) may result in a wide zirconium oxide
collar on the framework.
The insertion axis should therefore be determined in such a way to
allow an optimum view of all preparation shoulders of the abutment
teeth.
In difficult cases, it is advisable to rather incline the model to the
palatal/lingual side to achieve an optimum design of the restoration
on the buccal side.
Determination of the preparation margins and entering the base line
of the bridge pontic in bridge restorations.
Note: The base line defines the dimensions of the bridge pon-
tic rest in the design mode Multilayer and thus the dimensions
of the framework.
Example: clinical case with thin alveolar ridge
The base line is entered on the "gingiva" and on the blocked-out
part of the model (cf page 17 Model preparation) so that the desired
bridge pontic rest can be achieved.
Example: clinical case with thin alveolar ridge
–> with no blocking-out of the thin alveolar ridge, the base line
cannot be entered correctly.