Hello everybody, hi cosmicsport. About yor case, ask your dentist what kind of silicon he use ? - We had simmiar problems with Heraus Kultzer material specialy if impression was made in two time metod. (the abutments were extended ) so final job was not fiting at all.
Also if he's using shrinking liquid with silver, polieter material can grow snd your job will be too small. Best material that mostly solve our problems is polieter material violet colour Impregnum from 3M. Also your dentist have to use full metal spoon and press it in the mouth with same forece until it hard.
In the case that you have prep. full upper jaw dentist before should register patient with facial bow and took CR centric relation. It is a key to do a good restoration with muscle and joint comfort . Other way is a matter of luck !
tHE WHOLE job should be done in articulator.
WE ARE MAKING JOBS FOR A PATIENTS NOT FOR A STONE MODELS !