Overview
This study measured palladium ion release from two palladium-based dental alloys (Pd-Ag and Pd-Cu) under ISO 10271 standardized corrosion testing conditions (lactic acid solution, 37C, 7 days), comparing unpolished and polished specimens. Polishing dramatically reduced Pd release. The results are discussed in relation to the EU Nickel Directive corrosion limit and the prevalence of Pd sensitization in dental patients.
Key numbers
- Pd release range (cast and polished alloys): 0.06-0.69 ug/cm2/week
- Unpolished as-received Pd-Ag: 0.69 ug/cm2/week
- Polished Pd-Ag: 0.11 ug/cm2/week (6-fold reduction with polishing)
- ISO 10271 test conditions: lactic acid solution, 37C, 7 days
- EU Nickel Directive 94/27/EC limit for pierced jewelry: 0.4 ug/cm2/week (Ni; Pd release applied by molecular mass correction)
- Pd sensitization prevalence in dental patients: 7.4%
- Pd is second most frequent metal sensitizer after nickel (Ni)
Methods (brief)
ISO 10271 standardized corrosion immersion test for dental alloys in lactic acid solution at 37C for 7 days. Pd-Ag (Orion Argos) and Pd-Cu (Orion Vesta) alloys tested. Specimens in unpolished (as-received), polished, and different shape configurations. Pd concentration in solution measured by ICP-MS or AAS. Results compared with EU Nickel Directive corrosion threshold.
Implications
This page makes the source discoverable for palladium evidence routing. Provides quantitative Pd corrosion release data from dental alloys under standardized conditions, showing that surface finishing substantially reduces Pd ion release rates and that well-polished Pd-based alloys release Pd at rates below the Ni-equivalent threshold adapted from EU Nickel Directive 94/27/EC.
Related evidence
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