[Toxico-allergic phenomena connected to the use of nickel-containing alloys].

The biocompatibility of unprecious metal alloys, particularly those containing nickel, is controversial. Nickel is a known cancerous agent, and the main responsible of metal allergic reactions in human. Dentists must be aware about risks related to this material. It is mandatory carry out careful anamnesis about nickel hypersensitivity avoiding it in subject with known hypersensibility.