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.
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.
| 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
|
|
| Frequency | 50 Hz |
|---|---|
| Type | |
| Exposure duration | continuous for 2 h/day for 10 months |
| 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. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 100 µT | - | measured | - | - |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Exposure duration | continuous for 2 h/day for 10 months |
| Exposure source |
|
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 500 µT | - | measured | - | - |
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.
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