I also work in the dental field and I have to chime in.
It's not always as simplistic as getting a good impression for a snug fit. Much of it also has to do on the anatomy of the patient's mouth. The more of a ridge that you have the better the chances you will not need anchors or glue. Other factors could include mandibular tori, the depth of the floor of the mouth, how long you have been missing some or all of your teeth, etc. It's not always the dentist fault if they move, but it can be.
Good luck. I hope you don't have any issues.
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