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Exposure Assessment of Hazardous Chemical Agents for Dental Technicians in Ulsan City  

Hong, Youngho (Department of Occupational Health, Catholic University of Daegu)
Choi, Sangjun (Department of Occupational Health, Catholic University of Daegu)
Publication Information
Journal of Korean Society of Occupational and Environmental Hygiene / v.21, no.4, 2011 , pp. 215-221 More about this Journal
Abstract
Objectives: This study was conducted to evaluate the exposure level of hazardous chemical agents for dental technicians in Ulsan. Methods: We measured airborne total dusts and metals such as Nickel, Manganese, Cobalt, and Chromium in 10 dental laboratories by the NIOSH Methods 0500 and 7300, respectively. Methyl methacrylate (MMA), a key ingredient in acrylic resin, was also monitored using passive samplers for long-term sampling and Tenax tubes for short-term sampling. Results: Measured levels of all items were below 10% of the Korean exposure limit except for Nickel. The geometric mean concentration and geometric standard deviation of total dust, Nickel, and MMA were $0.14mg/m^3$ (2.16), $165.3{\mu}g/m^3$ (3.31), and 0.2 ppm (2.5) respectively. Airborne Nickel concentration of two dental laboratories exceeded the exposure limit ($1000{\mu}g/m^3$). The major emission sources of Nickel were metal trimming and casting processes. Conclusions: We found that Nickel, a carcinogen, should be controled most urgently to protect dental technicians.
Keywords
Dental technician; Nickel; Methyl methacrylate; Carcinogen;
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