Mercury vapor levels in dental spaces
Naval Graduate Dental School, National Naval Medical Center, 1972 - Medical - 6 pages
Mercury vapor in sufficient concentration can be toxic to humans. Studies showing vapor levels in dental operating rooms are conflicting in their results. The purpose of this investigation was to compare mercury vapor levels in the air of dental operating rooms at three separate naval facilities. Direct mercury vapor meter readings were taken in a newly remodeled 14-unit facility, an 18-unit student clinic, and a small, carpeted three-operatory clinic. Some conditions contributing to high mercury vapor levels were also evaluated. Highest mercury vapor concentrations for a working day were found in the small clinic, in which the mean value of 0.056 mg/cu m exceeded the revised threshold limit value (TLV). Activities such as carpet vacuuming, stamping of feet, and amalgam trituration momentarily increased mercury concentration to peaks up to 0.20 mg/cu m. A direct relationship was noted between the amount of mercury in the air and the amount of mercury in the urine of persons working in the room. (Author).
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14-unit facility 18-unit student clinic air of dental amount of mercury Bureau of Medicine carpet vacuuming compare mercury vapor concentration of mercury contaminated Dental amalgam dental offices dental operating rooms dental personnel dentist dentistry different heights Direct mercury vapor direct relationship floor G. B. PELLEU Graduate Dental School Gronka Hg/m highest mean Highest mercury vapor LEVELS IN DENTAL limit value TLV mean urine mercury mercury content mercury vapor concentration mercury vapor levels mercury vapor meter mercury was never mg/m micrograms per liter momentarily increased mercury National Naval Medical Naval Graduate Dental Naval Medical Center NGDS NNMC prosthetic laboratory readings were taken relationship was noted revised threshold limit rooms are conflicting rooms at three separate naval facilities showing vapor levels staff clinic sufficient concentration three naval dental three separate naval threshold limit value toxic to humans urine mercury level urine samples vapor in sufficient vapor meter readings Washington Navy Yard