The potential effects on human health of extremely low frequency magnetic field (ELF-MF) are of considerable
concern. In the present study, it was investigated the effect of long term ELF-MF exposure on microhardness of rat teeth.
Thirty male Sprague-Dawley rats were divided into three groups. The first and second
experimental groups (n=10) were exposed to 100 T and 500 T ELF-MF during 10 months, 2 hours a day
respectively. For the control group, nothing was applied to the rats and they completed their life cycle in the cage during the
study period. After ELF-MF exposure, microhardness of enamel surface was determined for each group.
decrease in microhardness in the second experimental group was found to be statistically significant compared to the
control group (P <0.05). However, no statistical difference was found between the first and second experimental groups (P >0.05).
From the results it can be concluded that 500 T level of magnetic field strengths may have a
certain negative effect on enamel mineralisation. Further investigations are necessary to analyse the effect of ELF-MF on
Vol.12 – n.4/2011
Harvard: B. Kargul, I. Yavuz, M. Z. Akdag, A. Durhan (2011) "Effect of extremely low frequency magnetic field on enamel microhardness in rats", European Journal of Paediatric Dentistry, 12(4), pp253-255. doi:
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