I would merge via scan, but Dr likes to ditch his own dies, and have them in one master stone model to then have the final fit on said model. They just don't always fit perfectly snug. Example- If imp 1 is over all the best but he likes #12 from imp 2, but #12 in imp 1 has air bubble etc. Thanks, guys- appreciate the feedback!
Forget about how snugly crowns fit using several models/dies, of course there's a difference.
***Insist on framework try-ins.
Always charge for extra poured models and or dies poured.
Never accept responsibility on cases that don't fit, and make that a very clear rule.
I put up with this BS with certain doctors years ago. Put the responsibility of die trimming, extra cost involved, and extra time needed on the doctor.
After making changes it was amazing how fast fewer impressions were taken after letting the doc accept the burden of their inability to take good impressions .
fyi.. Its takes a talented tech to make multiple impression cases work, so don't feel insecure about losing accounts like that. Dentist like this one is really trying to do a great job and you can't get upset, its part of our job. Just don't set yourself up to fail with techniques, and don't lose money on these kind of cases .