Canadian scientists used X-ray spectroscopy to compare new mercuryamalgams to those about 20 years old.
来自加拿大的科学家们使用了X射线光谱仪对崭新的汞合金填充物和那些用了20年的填充物进行了比对。
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"Dental amalgams contain mercury, which may have neurotoxic effects on the nervous systems of developing children and fetuses," reads a statement that has been added to the agency's Web site.