Screw Retained Bridge Design: How to deal with non-ideal implant placement
From exocad documentation
When designing Screw Retained Implant Bridges, there's two different scenarios which need to be treated differently - and exocad supports both.
A) When you have ideally placed implants, what you typically want is a smooth transition between the tooth and the emergence profile area, so that it emerges from the gingiva like a natural tooth. So, the software must adapt the tooth shape to the emergence profile margin.
B) When you have not ideally placed implants (which, in practice, happens quite often), we don't want to adapt the teeth to the implants at all. Instead, pontics should be used for all teeth, and their shape should be unaffected by the implant positions
Cases should be set up appropriately. If you set up the case for scenario A (thereby telling the software that they want adaptation to the implants!), when it's actually a case that falls in category B., then the result are strangely distorted teeth, with lots of free-forming necessary.
Here's a quick image on how to set up cases correctly in DentalDB for the different scenarios:
Note: The above options are available in exocad DentalCAD 2016 (Engine Build 6136) or later.
To use the "Library models to Pontics..." option, switch to Expert Mode during the tooth setup step (before teeth are adapted).