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  • Title: Ultramicroanalysis of dental plaque films by total reflection X-ray fluorescence.
    Author: von Bohlen A, Rechmann P, Tourmann JL, Klockenkämper R.
    Journal: J Trace Elem Electrolytes Health Dis; 1994 Mar; 8(1):37-42. PubMed ID: 7804028.
    Abstract:
    Microgram quantities of dental plaque were taken near amalgam fillings, gold crowns and intact teeth. Such extremely small samples can be analysed by total reflection X-ray fluorescence (TXRF), a fairly new variant of energy dispersive X-ray fluorescence (EDXRF). More than sixty samples were examined directly without chemical pretreatment. Fifteen elements of interest were detected simultaneously within a wide range of mass fraction and with detection limits of several mg/kg. A significant correlation of the Hg-accumulation in plaque and the amalgam fillings was established. Near these fillings Hg mass fractions can reach a level of 300 mg/kg. The results for other elements, e.g. Au, are less significant.
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