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Background and Aims: With increasing use of modern technology in some industries and communicating instruments and also electromagnetic field (EMF) due to transmission of high power electricity, radar beam, wireless instruments etc. study of electromagnetic radiation effects become a new subject these days. Since there is not much information regarding the effects of this kind of energy on live body tissues, present study was performed to determine these effects. Materials and Methods: In this study, 30 mice embryo were used and divided into two groups (case and control) of 15 each. Oral cavity tissues were selected for the examination. An electromagnetic producer machine which produced a field with frequency of 27 MHz and power output 493 watts. In the case group, mesenchymal tissues were affected by EMF for 20 mins. then were cultured on nutrient agar for 24 hrs. Results: In the case group, the mesenchymal compartments contain cartilage tissue and lost their epithelium in compare with those control which had no cartilage tissue and integrated epithelium. Conclusion: The study showed that high frequency EMF without other environmental stimulation such as warmth can produce metaplasia in embryonic mesenchymal tissues. Thus, avoiding from exposition to EMF for pregnant women is recommended.

Keywords: Electromagnetic Field; Mice; Embryo; Metaplasia; Mesenchyme

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