Test battery for metal allergy in dentistry

Area of Science:

• Oral Medicine
• Allergy and Immunology
• Materials Science

Background:

• Dental restorative alloys can trigger allergic contact stomatitis.
• Identifying causative metals is crucial for patient safety and material selection.
• Corrosion properties and patient history inform the development of patch test batteries.

Purpose of the Study:

• To evaluate the allergic potential of common dental alloy metal ions.
• To establish an effective patch test battery for diagnosing metal hypersensitivity in dentistry.
• To compare reactions in patients with stomatitis, dermatitis, and a control group.

Main Methods:

• 12 metal ions (e.g., Au3+, Pd2+, Ni2+) from dental alloys were tested epicutaneously.
• Aqueous salt solutions at specified concentrations were used for patch testing.
• Patients were divided into three groups: contact stomatitis, contact dermatitis, and controls.

Main Results:

• 11% of patients with stomatitis or dermatitis showed positive reactions to palladium (Pd2+).
• No reactions were observed for gallium (Ga3+), tin (Sn2+), or zinc (Zn2+).
• Silicon tetrachloride (SiCl4) at pH 0.5 induced irritant reactions in 41% of subjects.

Conclusions:

• Palladium and nickel are significant allergens in dental alloys, causing stomatitis and dermatitis.
• Gallium, tin, and zinc appear safe for use in dental restorations regarding allergic reactions.
• Patch testing with specific metal ions is valuable for identifying hypersensitivity to dental materials.