Overview
This International Archives of Allergy and Immunology study from the University of Verona (Departments of Clinical and Experimental Medicine and Maxillofacial Surgery / Odontostomatology) and the University of Palermo (Department of Clinical Medicine and Emerging Pathologies) tests whether nickel sensitization underlies recurrent aphthous stomatitis (RAS) in a large patient cohort. 380 consecutive RAS patients underwent patch testing for nickel and double-blind placebo-controlled oral nickel challenge. Among nickel-sensitive RAS patients, 45.7 percent had a positive DBPC oral nickel challenge, and 21 of 32 patients who followed a nickel-free diet experienced symptom improvement. The cohort is the largest controlled study of the nickel-RAS link and supports nickel sensitivity as a meaningful subset etiology for RAS that responds to dietary intervention.
Key numbers
| Measure | Result |
|---|---|
| RAS patients with positive nickel patch test | (subset of 380) |
| Positive DBPC oral nickel challenge among nickel-sensitive patients | 45.7 percent |
| Symptom improvement on nickel-free diet | 21 of 32 (65.6 percent) |
| Orthodontic-appliance-related onset | 28 of 380 (7.4 percent) |
| Chocolate/cocoa-aggravated symptoms | 352 of 380 (92.6 percent) |
Methods (brief)
Retrospective and prospective data analysis (1990-1999). All patients underwent standardized patch testing to nickel sulfate. DBPC oral nickel challenge with nickel sulfate vs placebo. Patients with positive challenge then followed nickel-free diet with structured outcome assessment.
Implications
- Certification: Demonstrates that a subset of RAS — a common oral mucosal disorder — has a nickel-mediated etiology amenable to dietary intervention. The 92.6 percent chocolate/cocoa-aggravated subset reinforces the cocoa-as-high-nickel-matrix framing on Cocoa and Chocolate.
- Microbiome / immunology: Oral mucosal allergic contact mucositis (ACM) is the parallel of cutaneous allergic contact dermatitis on the oral mucosa; both share type IV hypersensitivity mechanism.
- Courses: Standard reference for the nickel-RAS link and DBPC challenge methodology.
Related evidence
Update history
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