Is a nickel-chromium alloy porcelain crown toxic?

Porcelain-fused-to-metal crowns made of nickel-chromium alloy generally do not produce toxicity under normal use conditions, although a very small number of individuals may experience allergic reactions to its components. Nickel-chromium alloy is a common dental restorative material that offers good strength and durability, and is widely used in the fabrication of porcelain-fused-to-metal crowns. The nickel component in this material may be released in trace amounts under certain conditions, entering the oral environment. In most cases, this minimal release does not cause health concerns for the majority of people during use; however, individuals with allergic constitutions may experience local irritation or allergic reactions.

To ensure oral health, it is recommended to undergo regular dental checkups and monitor the condition of the porcelain crown and surrounding tissues. If symptoms such as redness, swelling, pain, or other abnormalities of the gums occur, prompt medical evaluation should be sought to determine if they are related to the nickel-chromium alloy. If a nickel allergy is confirmed, consideration should be given to replacing the restoration with alternative materials that have higher biocompatibility, such as all-ceramic or zirconia-based restorations. Maintaining good oral hygiene and avoiding excessive chewing of hard objects in daily life can help prolong the service life of porcelain-fused-to-metal crowns.