Completing a trifecta of refutation for the CAT studies, joining previous papers showing dose dependent effects of amalgam mercury on porphyrin metabolism and neurobehavioral performance, a new paper by David Geier et. al. shows exposure to mercury from amalgam is directly correlated with urinary mercury in children.


Hum Exp Toxicol. 2012 Jan;31(1):11-7. Epub 2011 Jul 29.

A dose-dependent relationship between mercury exposure from dental amalgams and urinary mercury levels: a further assessment of the Casa Pia Children’s Dental Amalgam Trial.

Source: Institute of Chronic Illnesses, Inc., Silver Spring, MD, USA.


Dental amalgams are a commonly used dental restorative material, and amalgams are about 50% mercury (Hg). In our study, urinary Hg levels was examined in children of age 8-18 years, with and without dental amalgam fillings, from a completed clinical trial (parent study) that was designed to evaluate the potential health consequences of prolonged exposure to Hg from dental amalgam fillings. Our study was designed to determine whether there was a significant dose-dependent correlation between increasing Hg exposure from dental amalgams and urinary Hg levels. Hg exposure depends on the size and number of teeth with dental amalgams. Overall, consistent with the results observed in the parent study, there was a statistically significant dose-dependent correlation between cumulative exposure to Hg from dental amalgams and urinary Hg levels, after covariate adjustment. Further, it was observed that urinary Hg levels increased by 18% to 52% among 8 to 18 year old individuals, respectively, with an average exposure to amalgams, in comparison to study subjects with no exposure to amalgams. The results of our study suggest that dental amalgams contribute to ongoing Hg exposure in a dose-dependent fashion.

PMID:  21803780 [PubMed – indexed for MEDLINE]

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