J. Orthod.
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British Journal of Orthodontics, Vol 21, 335-341, Copyright © 1994 by British Orthodontic Society

ARTICLES

Orthodontic rare earth magnets--in vitro assessment of cytotoxicity

L Bondemark, J Kurol and A Wennberg
Tandregleringskliniken (Orthodontic Clinic), Hassleholm, Sweden.

The aim of this study was to assess and compare in vitro the cytotoxic effects of uncoated and parylene-coated rare earth magnets, used in orthodontics. Cytotoxicity of samarium-cobalt magnets (SmCo5 and Sm2Co17) and neodymium-iron-boron magnets (Nd2Fe14B) was assessed by two in vitro methods, the millipore filter method and an extraction method. Orthodontic stainless steel brackets served as controls. Uncoated SmCo5-magnets showed high cytotoxicity while uncoated Sm2Co17- magnets demonstrated moderate cytotoxicity. Uncoated neodymium-iron- boron magnets, as well as parylene coated Sm2Co17-magnets and parylene- coated neodymium-iron-boron magnets, showed negligible cytotoxicity. Short-term exposure to a static magnetic field did not cause any cytotoxic effect on the cells.


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J. H. Noar and R. D. Evans
Rare Earth Magnets in Orthodontics: An Overview
J. Orthod., March 1, 1999; 26(1): 29 - 37.
[Abstract] [Full Text] [PDF]


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Copyright © 1994 British Orthodontic Society.