Overview
This review synthesizes mechanisms, clinical manifestations, prevalence, and therapeutic approaches for systemic allergic contact dermatitis to palladium, platinum, and titanium. The paper compiles patch test prevalence data from multiple countries and characterizes the CD8+ T cell-mediated mechanism, NKG2D receptor involvement, and the relationship between Pd and nickel (Ni) sensitization.
Key numbers
- Pd sensitivity prevalence in dermatitis patients: 9% (mainland Britain), 9% (Turkey), 8.3% (Austria unselected eczema), 7.4% (Germany), 13% (Israel), 2% (Northern Ireland)
- Mean Pd prevalence in dermatitis patients: 7.8% (range less than 1-19%)
- Mean Pd prevalence in dental patients: 7.4% (range 1.3-13.9%)
- Monosensitization to Pd: 0.2% dermatitis patients; 0.5% dental patients
- Young women (earring-wearing): 16.0% in 1995-1999, decreased to 9.1% in 2012-2016
- Older women: prevalence increased from 7.4% to 13.6% over same period
- CD8+ T cell depletion inhibits ear swelling in mouse model (CD8+ required for Pd sensitization)
- Mechanism: Pd ions activate NKG2D receptors on CD8+ cells, increasing IFN-gamma production
Methods (brief)
Narrative review of published studies on Pd, Pt, and Ti contact sensitization. Prevalence data compiled from patch test studies in multiple countries. Mechanistic data from murine and in vitro experiments. Therapeutic approaches reviewed from published case series and clinical trials.
Implications
This page makes the source discoverable for palladium evidence routing. Provides a synthesized prevalence summary showing Pd as a significant contact allergen affecting approximately 7-8% of dermatitis and dental patients, with the mechanistic pathway (CD8+/NKG2D/IFN-gamma) characterized.
Related evidence
Update history
No substantive edit history is available in this build. The full commit record is available in git.