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From Reuters
Wednesday, April 19, 2006
http://asia.news.yahoo.com/060419/3/2j9oh.html
CHICAGO -- Silver dental fillings widely used to fill cavities do
not appear to cause brain damage in children even though the mercury
in them is a known neurotoxin, according to studies published on
Tuesday.
"Dentists and parents can be very assured from the results of this
study that they can continue to put silver amalgam in children's
mouths to fill cavities," said Sonja McKinlay of New England
Research Institutes, Boston, who was involved in one of the studies.
That research involved 534 U.S. children aged 6 to 10 with cavities
waiting to be treated, half of whom were given silver fillings and
the rest a mercury-free white composite resin material. The children
had an average of 15 fillings done over the five years the study
lasted.
"We found that on IQ and other aspects of brain function, as well as
kidney function, the group that received the mercury-based amalgam
was exactly the same as those that received the composite," McKinlay
said.
The study said silver-mercury fillings have been used for 150 years
and 70 million are put into mouths in the United States each year.
But because they can contain up to 50 percent elemental mercury,
vapors released from the metal causes concern about possible nerve
and kidney damage.
The New England study, published in the Journal of the American
Medical Association and coordinated by Children's Hospital in
Boston, said no previous research has been published comparing
silver fillings with others to determine possible adverse impacts.
"In this study, there were no statistically significant differences
in adverse neuropsychological or renal (kidney) effects observed
over the five-year period in children whose caries (cavities) were
restored using dental amalgam or composite materials," the study
concluded.
In a second study in the same journal, researchers from the
University of Washington in Seattle reported similar findings.
Their study covered 507 children aged 8 to 10 in Lisbon, Portugal,
from 1997 to July 2005, who had either silver or composite fillings.
While children with silver fillings had higher levels of mercury in
their urine, there were no statistically significant differences
between the two groups in their scores on tests involving memory,
attention or visual motor function.
"These findings ... suggest that amalgam should remain a viable
clinical option in dental-restorative treatment," the study
concluded.
In an editorial in the same publication commenting on the studies,
Herbert Needleman, a physician at the University of Pittsburgh
School of Medicine, said further research is needed on whether there
are more "subtle effects" from the mercury.
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