John III with CAD Lab has been doing my zirconium work for a few years now and I have never had a problem with them. He knows every aspect of Sirona and is highly educated in the field. He has worked with me on the basic cases to those impossible cases and so far been successful with every zirconium case I have finished. If your looking for a new zirconium lab give John a shout.
Email John III at
http://dentallabnetwork.com/forums/s...ailmember&u=28
or send a PM
http://dentallabnetwork.com/forums/p...?do=newpm&u=28
and he will get back to you.