Mark Weiser, DDS

If you can take close-up photos of your smile (teeth closed) and two pics of your back teeth (teeth closed), i would be able to answer your question.

Even with Clear Aligners, one can get good maxillary expansion to create enough space for the severe crowding you have. This requires moving the premolars and first molars (the second molars will fall into place after treatment is completed most times).  Sometimes, if this is not enough space after expansion, one can do Interproximal Reduction (usually between the canine and first premolar).  There are very few cases I cannot do with Clear Aligners.

Your case is very complex.  I recommend a consult with a dentist who regularly restores implants.  If your existing teeth are maloccluded, then Ortho treatment should be performed prior to implant placement.  If there are nonrestorable teeth, they need to be removed as a first phase.

I get some pretty good expansion to achieve idealized arch form using clear aligners.  Ultimately, a removable sagittal appliance can be made to expand the arch.  I like trying the Clear Aligner first.

Do the Orthodontics first. The retainers will maintain the spaces.  THEN, replace the missing teeth, preferably with implants. Once the implants are done, then new retainers can be made--the old ones won't fit.