研究のタイプ: 医学/生物学の研究 (experimental study)

[ラット歯のエナメル質の微小硬度に対する900MHz無線周波放射の長期ばく露の影響] med./bio.

Effect of long term 900 MHz radiofrequency radiation on enamel microhardness of rat's teeth.

掲載誌: Oral Health Dent Manag 2014; 13 (3): 749-752

この研究は、ウィスターアルビノ雄ラット(n=21)を用い、歯のエナメル質の微小硬度に対する900MHz無線周波RF放射の影響を調べた。ばく露群(n=14)は1日2時間、週7日、10ヶ月のばく露対照群(n=7)はRF発生器をオフにして擬似ばく露を行った。ばく露擬似ばく露)は、放射アンテナの周囲にラット頭部を中心に向けて放射状に固定用容器並べて行った。全身SARは0.0369W/kgと計算された。実験終了時に歯のエナメル質の微小硬度を測定した。結果として、エナメル質の微小硬度にRFばく露は何も変化を与えなかった、と報告している。

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研究目的(著者による)

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.

詳細情報

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).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 890–915 MHz
Modulation type: pulsed
ばく露時間: continuous for 2 hours/d for 10 months
  • SAR: 0.0369 W/kg effective value (whole body)
  • SAR: 2.023 W/kg maximum (whole body)
  • 電力: 2 W peak

ばく露1

主たる特性
周波数 890–915 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 2 hours/d for 10 months
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • generator for GSM simulation
Distance between exposed object and exposure source 1 cm
チャンバの詳細 rats were placed in a Plexiglas tube carousel with their heads oriented towards the antenna of the GSM generator in the middle
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
SAR 0.0369 W/kg effective value 測定値および計算値 whole body -
SAR 2.023 W/kg maximum 測定値および計算値 whole body -
電力 2 W peak 校正 - -

Reference articles

  • Tas M et al. (2014): [精巣の組織および精巣上体の精液の質に対する携帯電話からの900 MHz無線周波放射の長期的な影響]

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

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.

研究の種別:

研究助成

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