DOTmed Home MRI Oncology Ultrasound Molecular Imaging X-Ray Cardiology Health IT Business Affairs
News Home Parts & Service Operating Room CT Women's Health Proton Therapy Endoscopy HTMs Mobile Imaging
Current Location:
> This Story

Log in or Register to rate this News Story
Forward Printable StoryPrint Comment




MRI Homepage

New VR app may ease MR anxiety Hope to cut down on the need to sedate patients

NYU releases biggest ever MR data set in AI Facebook collaboration With fastMRI, acceleration of imaging by factor of four 'already possible'

Elekta Unity MR-linac gains FDA 510(k) clearance Simultaneously delivers radiation dose and visualization of tumors

The imaging implant conundrum: scanning safely and efficiently The number of people with implanted medical devices is skyrocketing

Making the 'virtual biopsy' a reality with MR spectroscopy New techniques have big potential for MR imaging

Metrasens promotes MR safety data management solution and implant detection study Beyond ferromagnetic detectors

Canon debuts AI for image reconstruction and 1.5T MR at RSNA Advanced Intelligent Clear-IQ Engine and Vantage Orian

Philips debuts versions of its Ingenia Ambition 1.5T MR System Equipped with BlueSeal magnet, can perform helium-free operations

Siemens unveils syngo Virtual Cockpit software for CT, MR and PET at RSNA Offers remote expert technicians when needed

Dr. Michael Recht urges tech, data and AI innovation to rescue imaging at RSNA Insights from the opening session of RSNA 2018

High-field-strength MRs may cause
toxic mercury leakage from amalgam
fillings in patients

MR scans may unlock toxins from certain dental fillings

by John R. Fischer , Staff Reporter
A new study has found that the magnetic fields of ultra-high-strength MR may lead to leaks of toxic mercury from amalgam fillings in teeth.

"Mercury leakage from amalgam occurs in elemental (evaporization) and ionic forms,” lead author Selmi Yılmaz, a dentist and faculty member at Akdeniz University in Antalya in Turkey, told HCB News. “The elemental form is taken to the organism by inhalation. Ionic form is dissolved in saliva. After a rate of absorption, it is distributed to target organs and cells.”

Story Continues Below Advertisement


Special-Pricing Available on Medical Displays, Patient Monitors, Recorders, Printers, Media, Ultrasound Machines, and Cameras.This includes Top Brands such as SONY, BARCO, NDS, NEC, LG, EDAN, EIZO, ELO, FSN, PANASONIC, MITSUBISHI, OLYMPUS, & WIDE.

Amalgam consists of approximately 50 percent mercury, a toxin known to cause a range of symptoms from headache and insomnia to endocrine disruption and neurological impairment in humans. Previous research supports the idea that magnetic MR fields may cause mercury leakage, though the FDA considers amalgam fillings safe for adults and children over the age of six.

Researchers in the study opened up two-sided cavities in teeth extracted from patients for clinical indications and applied amalgam to each to examine the amount of mercury released.

Following nine days of assessment, two groups of randomly selected teeth were placed in a solution of artificial saliva and then exposed to 1.5-T and 7-T MR for 20 minutes. A control group was only placed in the artificial saliva.

Upon examining the saliva, mercury content for teeth exposed to 7-T MR was 0.67 ± 0.18 parts per million (ppm), four times the levels found in those exposed to 1.5-T at 0.17 ± 0.06 ppm and the control group at 0.14 ± 0.15 ppm.

Researchers chalk the high amount of mercury from ultra-high-field MR up to possibly a phase change in amalgam material or through the formation of microcircuits which, when exposed to magnetic fields, causes electrochemical corrosion.

The findings, according to Yilmaz, are among the first to study the impact of 7-T MR on amalgam dental fillings, which was approved in 2017 in an extremely limited capacity.

Though she adds that further research is required for assessing the safety and hazards that different amounts of mercury pose to humans as it is absorbed by the body.

“It is not clear how much of this released mercury is absorbed by the body,” she said in a statement.

No evidence of harmful effects were found in the 1.5-T group, a fact that motivated researchers to indicate that patients with amalgam fillings should not be unduly worried about undergoing an MR scan in such a machine.

Three ongoing projects focused on phase and temperature changes of dental amalgam across magnetic fields ranging from 1.5 to 14.1 Tesla are currently in the works.

The findings for this study were published online in Radiology.

MRI Homepage

You Must Be Logged In To Post A Comment

Increase Your
Brand Awareness
Auctions + Private Sales
Get The
Best Price
Buy Equipment/Parts
Find The
Lowest Price
Daily News
Read The
Latest News
Browse All
DOTmed Users
Ethics on DOTmed
View Our
Ethics Program
Gold Parts Vendor Program
Receive PH
Gold Service Dealer Program
Receive RFP/PS
Healthcare Providers
See all
HCP Tools
A Job
Parts Hunter +EasyPay
Get Parts
Recently Certified
View Recently
Certified Users
Recently Rated
View Recently
Certified Users
Rental Central
Rent Equipment
For Less
Sell Equipment/Parts
Get The
Most Money
Service Technicians Forum
Find Help
And Advice
Simple RFP
Get Equipment
Virtual Trade Show
Find Service
For Equipment
Access and use of this site is subject to the terms and conditions of our LEGAL NOTICE & PRIVACY NOTICE
Property of and Proprietary to, Inc. Copyright ©2001-2018, Inc.