From what I have read all dentists are required to learn how to do gold inlays and onlays in dental school. Gold inlays and onlays are said to be much more difficult to install properly than ceramic, but also are expected to last longer. Most people are choosing ceramic inlays or onlays rather than gold for cosmetic reasons, and also since gold will probably be much more expensive. One of my friends who is an MD had his fillings replaced with gold onlays and inlays. He didn't tell me what they cost, only that it was "quite expensive". I mentioned gold onlays to my dentists and he immediately tried to talk me out of getting gold rather than porcelain. If you do decide to spluge for gold, try to find a dentist who frequently does gold inlays and onlays.