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2TheApex:  Diamonds are a dentists' best friend.We always explain to the patient that we plan to try and keep the current crown unless we already know it's best to replace it or find a reason to replace it during the treatment.  "One risk of the procedure is that the porcelain could crack and you may need a new crown.  Of course, we take every precaution to avoid that."  The diamonds we use currently are Darby Dental product #959-4599 and the other is the Dura-cut diamond thru Brasseler product #5011987U0.  Both are about a #4 size round.Always use a lot of water and light pressure to "paint" away the porcelain.  Depending on the type of material it sometimes takes more than one bur to get the job done.  As soon as the cutting becomes inefficient it's time to replace it.