There is no panoramic view but you can set up curved multi-planar reconstruction view:
It would not take too much time to create a module that sets this up by a few clicks and you could also generate an image stack or projection image (traditional 2D panoramic view) using this approach or as described in this VTK journal article. If you are willing to contribute some development time or funding then you can make it happen soon, otherwise you need to wait for someone else’s contribution. There has been interest in improving Slicer usability for dentistry, but I’m not sure if anything materialized.
Use the latest stable version (4.8.1).