Had a front tooth that had been filled over the years and the filling would periodically fall out (another $300). Got to the point it was useless to keep trying so had it crowned today. The dentist drilled it to accept a crown then with a cad/cam pedestal computer designed the crown to fit in the space and then read it into a 3D Printer. They have a resin 1"x1" block and it's like a mini lathe forming it into a crown. Here it is making the crown. The lines are a water spray. Once done it is fitted then it is baked for 15 minutes and is as hard as a normal tooth.