[Efficiency of various dental dust-aspiration-equipment regarding the treatment of cobalt-chromium alloys].
The comparative measuring of the dust-seizure-efficiency of aspirators is being carried out by a practice-related treatment of 5 cylindrical-shaped specimen made of a commercial cobalt-chromium-alloy with aluminum-oxide-grinding instruments and silicone-rubber-polishers. A small-filter-apparatus takes up the person related samplings of the occurring total-dust-amount, which is then being calculated by a gravimetric standard-measuring-procedure. The cobalt-chromium-dust-fraction in the total dust amount is determined through an x-ray-fluorescence-analysis. Workplace dust-aspiration-equipment of the firms KaVo, Freuding and Wassermann have been subjected to testing. The values of the efficiency of all aspirators turned out to be below the American Threshold Limit Value TLV-TWA (Threshold Limit Value-Time Weighted Average) of 0.5 mg/m3 for chromium. The strict TLV-TWA-value of 0.05 mg/m3 for cobalt it also--with the exception of the Freuding-aspirator A 84 with aspiration-tube--not exceeded.
Ziegler
W
W
Fachbereich Zahn-, Mund- und Kieferheilkunde Polikliniken Nord der Freien Universität Berlin.
Meyer
E
E
D000395:Air Pollutants, Occupational; D016902:Air Pollution, Indoor / Q000517:prevention & control*; D002858:Chromium Alloys; D004391:Dust / Q000517:prevention & control*; D006801:Humans; D007754:Laboratories, Dental; D016273:Occupational Exposure / Q000517:prevention & control
D000395:Air Pollutants, Occupational; D002858:Chromium Alloys; D004391:Dust
Effektivität verschiedener dentaler Staubabsaug-Anlagen beim Bearbeiten von Kobalt-Chrom-Legierungen.