[Cytocompatibility of dental alloys containing palladium].

The cytoxicity and the 50% lethal concentration (LC50) has been assessed in vitro by the colony forming method in extracts of 5 precious or semiprecious alloys and of oxides and chlorides of the metal contained in these alloys: Pd, Ag, Cu, Zn, Sn, In and Ga. All alloy extracts in culture medium induced cell death depending on their composition. In, Ga and Sn compounds showed the most favorable cell viability, Cu and Ag salts induced the lowest survival rate.

[The in vitro biological behavior of TiNb30 alloy treated with hydroxyapatite and tricalcium phosphates].

An in vitro study has been carried out in different cell systems to determine the biological response of TiNb30 alloy before and after a surface treatment with hydroxyapatite (HA) and tricalcium phosphate (TCP) by the sol-gel method. TiNb30 pure Ti induce favorable cell viability with respect to pure Ni showing a high cytotoxic effect. After surface treatment with HA or HA-TCP mixtures, no difference in cell proliferation can be observed between amorphous and cristalline forms.

Biological and hepatotoxic effects of palladium. An overview on experimental investigations and personal studies.

Workers are occupationally exposed to Pd and Pd-complexes during the refining process, in particular in Pt-refineries. The metal is increasingly used as component in fine jewellery, is commonly present in dental alloys, and is also employed in telecommunication systems.In view of the toxicity of Pd when absorbed and anticipating the possible entry of some of this material into man's environment from the use of automotive catalitic converters, the retention, tissue distribution, excretion and placental transfer of Pd were determined by several authors following different administration routes in animal experiments.