Occupational Exposure to Dental Mercury Contaminated Particulate Matter from Amalgam Tooth Fillings скачать в хорошем качестве

Occupational Exposure to Dental Mercury Contaminated Particulate Matter from Amalgam Tooth Fillings

Occupational Exposure to Dental Mercury Contaminated Particulate Matter. Mark Richardson PhD Mark Richardson PhD (formerly of Health Canada) discusses his study, "Inhalation of mercury-contaminated particulate matter by dentists" published in the Journal of Human and Ecological Risk Assessment, which examined the amount of mercury contaminated particulate matter dentists are exposed to from the removal of amalgam fillings. This respirable particulate matter represents the vast majority of daily Hg exposure in practicing dentists, which can often exceed OSHA safety limits. When we asked Mark Richardson..."would patients be equally exposed", here was his response... Not exactly. Although any given patient would have the same particulate exposure during a removal, and exposure to the same vapor concentration in the breathing zone during the removal, the patient would not be exposed to the particulate of 4 removals per day (average used in paper) nor would the patient be exposed to the Hg vapor in the office air throughout the remainder of the working day (as assumed for the dentist). Finally, the patient would not be exposed day in and day out to the particulate. In very approximate terms, the patient having a single removal would be exposed to approx 1/4th of the average daily exposure estimated for a dentist. However, the patient exposure would be considered 'acute' (single 'dose' or very short term duration) rather than chronic. Therefore the determination of risk would be very different, and would be considered much less serious than an equivalent exposure that continues daily over years.