24 pregnant rats were divided into two groups (n=12 each): an exposure group and a sham exposure group, which were (sham) exposed during gestation. After birth, their offspring was further (sham) exposed in two groups with n=24 animals, respectively. On the 7th, 14th, and 21st day after birth, n=8 offspring rats from each group were killed and examined, respectively.
|Repetition frequency||217 Hz|
|Chamber||specific room with plastic furniture and walls completely covered with chromium-nickel sheets|
|Setup||six rats were exposed simultaneously in ventilated cylindrical PVC restrainers; animals were placed with close contact to the antenna; exposure systems and procedures were kept in a Faraday cage, which had a shielding effectiveness of 100 dB|
|Sham exposure||A sham exposure was conducted.|
|SAR||9 mW/kg||-||measured and calculated||-||± 2 mW/kg; for the head|
The only significant differences between exposed and sham exposed animals were found in the elemental composition of the incisors after 21 days. The amounts of strontium and iron were significantly increased whereas boron, copper and zinc were significantly decreased in the exposure group compared to the sham exposure group.
The authors conclude that a prenatal and postnatal exposure of rats to a 2.45 GHz electromagnetic field has no effects on the development of teeth. However, changes in the chemical elemental composition of teeth with unknown consequences might be induced.