EMF-Portal | Influences of extremely low frequency magnetic fields on mineral and trace elements content of rat teeth

Influences of extremely low frequency magnetic fields on mineral and trace elements content of rat teeth med./bio.

By: Yavuz I, Akdag MZ, Dasdag S, Ulku SZ, Akkus Z

Published in: Afr J Biotechnol 2008; 7 (21): 3811-3816

Aim of study (acc. to author)

Background/further details

Rats were divided in three groups: 1.) control group (n=7), 2.) magnetic field exposure (100 µT, n=10) and 3.) magnetic field exposure (500 µT, n=10). The exposure started in the age of four month.

Endpoint

Exposure

Exposure	Parameters
Exposure 1: 50 Hz Exposure duration: continuous for 2 h/day during 10 months	magnetic flux density: 100 µT magnetic flux density: 500 µT

Exposure 1

Main characteristics

Frequency	50 Hz
Type	magnetic field
Exposure duration	continuous for 2 h/day during 10 months

Exposure setup

Exposure source	Helmholtz coils
Setup	pair of Helmholtz coils with a diameter of 25 cm each and 225 turns of insulated copper wire with a diameter of 1 mm, placed horizontally inside a 130 cm x 65 cm x 80 cm Faraday cage for shielding; coils facing each other with a distance of 25 cm; rats placed in a 17 cm x 17 cm x 25 cm methacrylate cage inside the coil system
Sham exposure	A sham exposure was conducted.

Parameters

Measurand	Value	Type	Method	Mass	Remarks
magnetic flux density	100 µT	-	measured	-	-
magnetic flux density	500 µT	-	measured	-	-

Additional parameter details

ICNIRP limit for public exposure: 100 µT ICNIRP limit for ocupational exposure: 500 µT stray fields during sham exposure: 0.1 µT geomagnetic field parallel to the exposure field: 14 µT geomagnetic field perpendicular to the exposure field: 34 µT

Methods Endpoint/measurement parameters/methodology

Investigated system:

rat teeth

Time of investigation:

after exposure

Main outcome of study (acc. to author)

The calcium content in the rat teeth was significantly higher in both exposure groups when compared to the sham exposure. In the 500 µT-exposed group, the contents of zinc, magnesium and phosphorus were significantly increased compared to the 100 µT-exposed group and the sham exposed group. However, no significant differences in the content of zinc, magnesium, phosphorus were seen between the 100 µT-exposed group and the sham exposure.
The authors conclude that exposure to extremely low frequency magnetic field could influence the mineral content in rat teeth.

Study character:

medical/biological study
experimental study
full/main study
blind study

Study funded by

not stated/no funding

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Ince B et al. (2012): Can exposure to manganese and extremely low frequency magnetic fields affect some important elements in the rat teeth?

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