engleski

Anodic sampling and TLC identification of dental alloys

Knowledge of the composition of an incorporated alloy is a precon- dition for avoiding polymetallism in subsequent prosthetic treat- ment, or detection of the cause of an allergic reaction attributed to a metallic component of the prosthesis restoration. The method pro- posed in this paper can be a very useful means of determining the presence of Ni–Cr or Co–Cr dental alloys, and, especially, beryllium in Ni–Cr alloys which, despite its toxicity, gives the alloy desirable properties. Nickel is also a well-known allergen. This paper reports an analytical procedure for detection and identification of cobalt- and nickel-based dental alloy components. The method involves anodic sampling, and separation and identification of the compo- nents by thin-layer chromatography on precoated microcrystalline cellulose layers. Computer-assisted optimization was used to choose the mobile-phase composition. Excellent detection and identifica- tion of nickel, chromium, cobalt, molybdenum, and beryllium, on the basis of different RF values and spot colors, was achieved after anodic sampling in-situ. Microanodic dissolution of dental alloys enables intra-oral, in-situ, and almost non-destructive sampling of a permanent prosthesis restoration.

dental alloys ; anodic sampling ; TLC ; mobile phase optimisation

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