Mercury vapor released from a single amalgam restoration in pregnant rats & mercury concentrations in maternal and fetal rat tissues were studied. Mercury in the air samples increased 20-fold after chewing. The placement of a single amalgam increased the levels of mercury in the maternal brain, liver, lung, placenta and 20 times in the kidneys. Highest mercury concentration in fetal organs was found in the liver, kidneys & brain
Mercury vapor released from one, two and four amalgam restorations in pregnant rats and mercury concentrations in maternal and fetal organs were studied. A highly significant correlation was also found between the number of amalgam fillings and their surface areas. Mercury concentrations in major maternal organs with one, two and four amalgam fillings tended to increase with the increasing amalgam surface areas.
There is little information about Hg concentration in human amniotic fluid (AF) of pregnant women and its potential toxic effect on the fetuses. This study assessed the relationship between the presence of detectable mercury (Hg) concentration in human AF, number and surface areas of amalgam fillings of pregnant women; secondary to analyse their obstetric history and perinatal complications. The number and surface areas of amalgam fillings influenced positively Hg concentration in amniotic fluid.
From our results it can be concluded that infants can accumulate mercury, derived from maternal amalgam fillings, in their kidneys. Therefore the unrestricted application of amalgam for dental restorations in women before and during the child-bearing age should be reconsidered in analogy to the recommendation of the German Health Authorities, which argued that because of a higher vulnerability of infants to mercury, amalgam cannot be further recommended for dental restorations for children.
In humans, the continuous release of Hg vapor from dental amalgam tooth restorations is increased for prolonged periods after chewing. All fetal tissues examined displayed Hg accumulation. Highest concentrations of Hg from amalgam in the adult occurred in kidney and liver, whereas in the fetus the highest amalgam Hg concentrations appeared in liver and pituitary gland. The placenta progressively concentrated Hg as gestation advanced to term.
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