I dont do study models much, the Orthodontists that I work for all have in-house Assistants or lab technition to do their models, a lot more cost effective for them believe me! I get one or so a month from General dentist that do ortho. THey usually call me and tell me they have impressions and I make it a point to pick-up ASAP. I also have a small refregirator in my lab that I store them in if I cant pour up right then.
I have heard a few labs that have stopped doing study models, too. For your same reasons.
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