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Bisphenol-a is an estrogenic compound which is a degradation product of the polymer bisphenol-a glycidyl methacrylate (BIS-GMA) used in dental materials. Human exposure to bisphenol-a may also arise from epoxy resins used as coatings in food and beverage cans. Bisphenol-a is an industrial pollutant and has been detected in atmospheric fallout and surface waters, which may also contribute to exposure. Therefore, a study was undertaken to estimate potential exposure from composite resin dental materials, from canned foods and beverages and from ambient air. Applying probabilistic exposure assessment methods, and using available data and information on the release of bisphenol-a from dental composites, on bisphenol-a concentrations in canned foods, canned beverages and ambient air, total adult exposure was estimated for the Canadian population. Calculations indicated that mean total exposure from all sources was about 65 times lower than a tolerable daily intake (TDI) for bisphenol-a derived by Health Canada to address potential estrogenic effects of this compound. Maximum estimated exposure was also less than this TDI. On average, composite resin dental materials and canned foods contributed approximately equally to total exposure whereas canned beer, canned soft drinks and ambient air were relatively insignificant sources of exposure.
bisphenol-a, composite resin dental materials, food, air, exposure, risk
O'Connor Associates Environmental Inc., Ottawa, ON
O'Connor Associates Environmental Inc., Oakville, ON
O'Connor Associates Environmental Inc., Calgary, AB