A wide range of materials are used in routine and cosmetic dentistry, including metals and their alloys, polymers, ceramics and composites. Dental applications of metals and alloys include fillings, prosthetic devices (crowns, bridges and removable prostheses), dental implants and orthodontic appliances.
Nickel is found in many alloys used in dental treatment to provide improved physical and chemical properties, such as strength and durability, as well as to reduce the cost of using precious alloys such as gold. The amount of nickel in any dental alloy can vary from a few per cent to over 60%. Nickel alloys are recognized for their ability to withstand the harsh oral environment and have a long-standing history of successful use in dentistry.
Nickel dental alloys are used in the construction of long-term restorations designed to remain in clinical service for many years, including crowns, fixed bridges and removable partial dentures. They are also used for shorter-term applications, such as in orthodontic appliances to move and straighten teeth.

Nickel is a common allergen and the use of nickel-containing materials in dentistry has sometimes been reported as a source of adverse reactions. This advisory note aims to provide reassurance and advice about the safe use of nickel as part of an alloy in dental materials.