Q. Hi, I’ve had 3 crowns fitted the first was metal based layered with porcelain – this was ok but I had a dark gum line. So I decided to have the next 2 crowns ‘all ceramic’ to avoid this dark line, but the dark gum line is even worse with the ceramic crowns. After reading up about crowns on the web and something a stand in dentist said at my practice I’m wondering if I’ve paid for ceramic but got the cheaper metal and porcelain crowns. Please advise.,