I've just had a root canal filling and the dentist is recommending ceramic crowns only to replace existing gold crowns in the filled teeth (the most expensive option, also). He is also advising strongly against mixing the crown materials although that had not been presented as a problem on the first consultation.
I have existing gold crowns and he says that a silver under a gold crown could cause a possible sparking (he was translating from German so I'm not sure I have the right meaning).
Your insights would be gratefully received. 🙂