Study type: Medical/biological study (experimental study)

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

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

Aim of study (acc. to author)

To examine the effects of exposure to extremely low frequency magnetic fields on the mineral content in rat teeth.

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

Exposure 1

Main characteristics
Frequency 50 Hz
Type
Exposure duration continuous for 2 h/day during 10 months
Exposure setup
Exposure source
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 - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
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:

Study funded by

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