The fact mercury makes up roughly 50 percent of the content of dental amalgam is a contentious subject for many, and a new study that found MRIs can release the toxic heavy metal from fillings is sure to give those in the anti-amalgam camp even more to chew on. But before you start digging all the fillings from your teeth with a chisel, it’s worth noting that this effect was only found to relate to new ultra-high-strength MRIs.
Most current MRI machines are rated as 1.5-T and 3-T, where the ‘T’ stands for Tesla, the unit of measurement used to describe the strength of an MRI’s magnet. Any mercury leakage as a result of exposure to a 1.5-T or 3-T MRI is minimal, however, there are new 7-T MRI machines capable of producing more detailed images whose effect on amalgam fillings has not been studied. Dr Selmi Yilmaz and Dr Mehmet Zahit Adişen set out to change that.
“In our study, we found very high values of mercury after ultra-high-field MRI,” Dr. Yilmaz says. “This is possibly caused by phase change in amalgam material or by formation of microcircuits, which leads to electrochemical corrosion, induced by the magnetic field.”
The researchers began with a collection of teeth, opened two-sided cavities in each and applied amalgam fillings to the cavities. After nine days, three groups of 20 randomly selected teeth were placed in a solution of artificial saliva. One group of teeth was then subjected to 20 minutes of exposure to a 1.5-T MRI, the second was exposed to a 7-T MRI, while the control group of teeth received no exposure.
The artificial saliva from each batch was then analyzed for mercury content and it was found that the 7-T group had approximately four times the mercury levels of the 1.5-T and control groups.
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