Holy shit, I'm really impressed with the high tech park my dentist has. She takes pictures of a tooth, a computer makes a 3D model out of that, then she grinds down the tooth as necessary and takes pictures again.

From the difference, the computer generates the data for the tooth crown, including warning spots where it could be too thin so that a bit more grinding is needed.

Then she corrects some spots manually and sends it over to the CNC machine in the next room that cuts the thing from a ceramics block with correct colour. Some heat treatment later, and the tooth crown fits perfectly.

Gone are the days with dental imprints, provisional crown and not quite fitting final crown.