Andrew Gabriel wrote:
My dentist does that when I break a tooth. (CEREC)
However, the software is probably very expensive, and the "printer"
is a tiny milling machine which makes up a new piece by milling a
small block of ceramic for 20 minutes while you go back into the
waiting room (or in my case, stand there and watch it being milled).

Sounds like there are DIY options:

http://makezine.com/2013/05/24/new-p...using-arduino/
http://hackaday.com/2011/12/01/cheap...te-impressive/

Something using a Kinect or similar might be one idea.

Theo