Can a person be allergic to the porcelain or metal in a crown?
I know of no situation in which a person has exhibited an allergic sensitivity to all-porcelain restorations. Porcelain consists of metal oxides which are fused into glass. Since dental glass is formulated to be insoluble in water (or any fluid that can safely enter the mouth), the metallic molecules are not biologically available to interact with the patient’s immune system. On the other hand, it is possible to be allergic to nearly any metallic dental alloy. Even gold can prove to be an allergen occasionally, but since it does not dissolve in oral fluids under most circumstances allergy to gold is very rare (on the order of 1 in a million). Porcelain cannot be adhered to pure gold, and gold, by itself is too soft to be of practical use as a framework under porcelain. Thus, other alloys must be used under porcelain-fused-to-metal restorations. Gold is frequently used as a major component of these alloys. High gold content metals used in the fabrication of Porcelain-fused-to-metal crow
