Adjusting crown / bridge

[PostHeads123]

Due to an accident I needed a crown replaced on a dental implant, I also lost the tooth in front of the implant due to the accident so the plan was a 2 two tooth crown on the single implant, cost just for the double crown £1800. I got the crown fitted and my expectation was it would be a precise fit and wouldn't need much adjusting, however they ended up spending 25mins heavy drilling it particularly the bite part of them to get it right, in doing so chipped a bit of the new crown. Does a crown / bridge usually need heavy adjustment to fit or does it sound like they were sloppy taking the impression?

Thanks