[Indices of free-radical oxidation of the saliva in subjects wearing dentures made of various materials under ordinary conditions and in the presence of industrial hazards].
In order to define the material fit for prostheses in subjects occupationally exposed to adverse factors, the authors have examined the reaction to chromium-nickel steel, gold, acrylic plastic, cast, glass ceramic by the characteristics of mixed human saliva free-radical oxidation (FRO): the levels of malonic dialdehyde and activities of superoxide dismitase and catalase. Cr-Ni steel and acrylic plastic were found responsible for the greatest changes in FRO in subjects occupationally not exposed to adverse factors. Cast glass ceramic exerted the least effect on FRO. Gold impaired FRO to a much lesser extent than steel or plastic, though more than glass ceramic. Adverse occupational exposures augmented the shifts, but FRO characteristics in subjects with prostheses made of cast glass ceramic, occupationally exposed to adverse factors, in fact did not differ from the reference values.