Correlation has previously been observed between the incidence of metal hypersensitivity (Ni, Cr, Co) and the incidence of infection after internal fixation of bone fractures. As there is no doubt that exposure to high concentrations of metal can cause allergy, metal levels (Cr, Ni, Mo, Co) were analyzed in implant contact tissues by ASS. Both the absolute concentration of the ions and the Ni:Cr ratio in the tissues adjacent to metal implants is greater in infected cases than in non-infected. Thus infection as a cause of allergy has to be considered. In view of the resulting problems perhaps consideration could be given to the use of a different alloy for metal implants.
W iderspriiche bei der Bestimmung des an Legierungselemente gebundenen Stickstoffs. Verhalten des Stickstoff.~ beim Erhitzen von Stiihlen und N itriden im W asserstoffstrom. Bestimmung des beweglichen Stickstoffs durch coulometrische Titration des gebildeten Ammoniaks. Arbeitsweise und Analysenergebnisse.Contribution to the problem of determining the free and the combined nitrogen in steels. Contradictions regarding the determination of nitrogen combined with alloying elements. Behaviour of the nitrogen when steels and nitrides are heated in a current of hydrogen. Determination of the movable nitrogen by coulometric titration of the ammonia formed. Practice and results of analysis.
Investigation of nitrides occurring in ternary iron alloys and their chemical properties. Investigations into nitrides in iron alloys. Shape and structure of the nitrides. Chemical properties of nitrides. Attempts to determine solubility products of nitrides in the alloy matrix.Etude des nitrures formes dans les alliages ternaires de fer et dc leurs proprietes ehimiques, Recherches pour preeiser la connaissance des nitrures dans les alliages de fer. Habitus ei structure des niirures. Proprietes chimiques des nitrures. Essais de determination des produits de la solubilttB des nitrures dans la matrice des alliages.
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