Abstract
In recent years there have been several reports on concomitant patch test reactions to palladium and nickel, which belong to the same group in the periodic table. Exposure to palladium mainly takes place via dental alloys and jewelry. However, the clinical relevance of simultaneous reactivity to these metals is unknown. To elucidate the question of cross-reactivity, guinea pigs were induced with palladium or nickel and simultaneously challenged with palladium and nickel. Animals sensitized to palladium according to the guinea pig maximization test method (GPMT) or to a new method by van Hoogstraten & Scheper (H&S) reacted to palladium as well as to nickel. On the other hand, animals sensitized to nickel according to H&S reacted to nickel but not to palladium. The GPMT shows that palladium is a more potent sensitizer than nickel: could palladium be the primary sensitizer in humans?
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