Nikanjam et al. test the effect of adding silver nanoparticles (AgNPs) at 0, 250, or 500 ppm to feldspathic porcelain ceramic disks on color stability after thermocycling in tea, orange juice, and artificial saliva. Disks with AgNPs showed less color change (lower CIEDE2000 delta-E values) than controls, with 500 ppm AgNPs in artificial saliva producing the minimum color shift.
Key numbers
- AgNP concentrations in porcelain: 0 ppm (control), 250 ppm, 500 ppm (abstract).
- Maximum color change: 0 ppm porcelain in orange juice (abstract).
- Minimum color change: 500 ppm AgNP porcelain in artificial saliva (abstract).
- Statistical significance: ANOVA showed significant difference in delta-E00 between groups (p less than or equal to 0.05) (abstract).
Methods (brief)
Ceramic disks were fabricated, thermocycled (simulating oral conditions), and immersed in three staining solutions. Color was measured before and after using CIEDE2000 formula with a colorimeter. One-way ANOVA and Tukey post hoc test compared group means.
Evidence fitness
This is a dental biomaterials paper. Silver nanoparticles are a ceramic additive used to improve color stability and antimicrobial properties of dental restorations. This paper has no relevance to dietary silver exposure or food safety. It is included in the deposit because silver nanoparticles are used in a non-food material context.
Limitations
Not a food safety paper; dental material testing does not inform dietary silver intake. Silver release from porcelain into saliva was not measured in this study.
Related evidence
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