A couple of months ago I went to the dentist and found I needed a cap.
The in the mouth prep was the Same. But before he started he took a bunch of scans of the tooth.
When the prep was done, he left the room and came back with a 3D printed and milled copy of my two. Two small hits with a grinder, and it was fit in perfectly.
I work in the tech field, but even I was impressed by this. I felt like I was in the 25th century.