Should I dissolve fillers before Ulthera?

Ulthera will work with fillers in place. It may dissolve some of the filler. You can re inject fillers after the Ulthera treatment. You should also consider fat injections to correct the depressions.

I would not dissolve your fillers before your Ulthera result, unless you are unhappy with the fillers regardless of whether you planned to have Ulthera.  I would make sure that your filler treatment is done several weeks to a month before your Ulthera treatment.  The other procedure you may want to consider if you have facial asymmetry after surgery is Sculptra.  It might be a more versatile tool in the right hands to help build more symmetry in the face.

We prefer to perform Ultherapy face and neck skin tightening prior to filler injectable procedures. However, we have had experiences with patients who have done just fine and get good results from Ultherapy having had fillers previously (as short as 4 weeks prior) and have seen very modest degradation of the prior filler injection. Bottomline is we do not know how much of the filler may be degraded from ultrasonic energy delivered by Ultherapy and thus I have a preference of performing Ultherapy first prior to filler injections.