Study type: Medical/biological study (experimental study)

Effect of extremely low frequency magnetic field on enamel microhardness in rats. med./bio.

Published in: Eur J Paediatr Dent 2011; 12 (4): 253-255

Aim of study (acc. to author)

The effects of a chronic whole body exposure of rats to 50 Hz magnetic fields on the microhardness of the dental enamel surface should be investigated.

Background/further details

30 rats were separated into the three following groups: 1) 10 sham exposed individuals, 2) 10 individuals exposed to the 100 µT magnetic field and 3) 10 individuals exposed to the 500 µT magnetic field. At the end of the experiment, all rats were anesthetized and their teeth were extracted.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: continuous for 2 h/day for 10 months
Exposure 2: 50 Hz
Exposure duration: continuous for 2 h/day for 10 months

Exposure 1

Main characteristics
Frequency 50 Hz
Type
Exposure duration continuous for 2 h/day for 10 months
Exposure setup
Exposure source
Setup pair of Helmholtz coils with a diameter of 225 cm, consisting of 25 turns of insulated copper wire with a diameter of 1 mm; coils placed horizontally facing each other at a distance of 25 cm; methacrylate cage positioned between the coils; exposure system placed inside a 130 cm x 65 cm x 80 cm Faraday cage
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 100 µT - measured - -

Exposure 2

Main characteristics
Frequency 50 Hz
Type
Exposure duration continuous for 2 h/day for 10 months
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
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)

Compared to sham exposure, microhardness of the dental enamel was insignificantly lower in group 2 and significantly lower in group 3.
The authors conclude that a chronic exposure of rats to a 50 Hz magnetic field with 500 µT may have a negative effect on the hardness of dental enamel.

Study character:

Study funded by

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