I'll add digital on-site radiography processing, i.e. an x-ray is taken by the dentist, the film is processed and scanned in the next room over, and available on the touchscreen in the dentist's room 5 minutes later. That was a week's return by mail 15 years ago.

I've also heard of crowns being 3D imaged and milled from a ceramic blank while the anesthetic takes effect, but only from one person.