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The effects of a chronic head exposure of rats to a 900 MHz electromagnetic field on the enamel micro hardness of teeth should be investigated.
21 rats were randomly divided into the following two groups: 1) sham exposure (n=7) and 2) exposure (n=14). Immediately after the last exposure, all animals were anesthetized and their teeth were removed. Ten incisive teeth were analyzed per group and five measurements were taken per tooth, respectively (total of n=50 per group).
|ばく露時間||continuous for 2 hours/d for 10 months|
|Repetition frequency||217 Hz|
Enamel micro hardness was decreased in group 2 (exposure) compared to group 1 (sham exposure) but the difference was not statistically significant.
The authors conclude that a chronic head exposure of rats to a 900 MHz electromagnetic field has no effect on the enamel micro hardness of teeth. However, they presume the existence of a minor effect and propose further studies with prolonged exposure durations to clarify the topic.