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The Effect of Pulsed Electromagnetic Fields on Microleakage of Amalgam Restorations: An in Vitro Study


Maryam Paknahad 2 , Shoaleh Shahidi 3 , Seyed Mohammad Javad Mortazavi 5 , Ghazal Mortazavi 4 , Mahdi Saeedi Moghadam 4 , Ali Dehghani Nazhvani 6 , *


2 Department of Oral and Maxillofacial Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, IR Iran

3 Biomaterial Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, IR Iran

5 Medical Physics and Medical Engineering Department, School of Medicine, Shiraz University of Medical Sciences, Shiraz, IR Iran

4 Ionizing and Non-Ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, IR Iran

6 Oral and Maxillofacial Pathology Department, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, IR Iran


Shiraz E-Medical Journal: 17 (2); 32329
Published Online: January 22, 2016
Article Type: Research Article
Received: August 10, 2015
Accepted: January 2, 2016




Background: Previous studies have reported an increase in the mercury release from dental amalgam restorations, following exposure to electromagnetic fields generated by sources such as mobile phones and magnetic resonance imaging (MRI). It has also been shown that MRI increases microleakage of amalgam restorations. In this study, Helmholtz coils are used for generating pulsed electromagnetic fields (PEMF).

Objectives: The purpose of this study was to evaluate the effect of PEMFs on microleakage of amalgam restorations, using a pair of Helmholtz coils.

Patients and Methods: Standardized class V cavities were prepared on the facial surfaces of 46 non-carious extracted human premolars. Then, the samples were randomly divided into experimental and control groups, each containing 23 teeth. The experimental group was exposed to the uniform magnetic fields generated by a pair helmholtz coils. The magnetic field strength at the central point of the two coils was 0.1 mT. All specimens were placed in 2% basic fuchsin solution. Then the teeth were sectioned, examined under a stereomicroscope, and scored for microleakage according to the degree of dye penetration.

Results: There was no significant difference between the two groups regarding the microleakage score.

Conclusions: The results of the present study suggest that PEMF exposure does not have adverse effects on microleakage of amalgam restorations.


Pulsed Electromagnetic Fields Amalgam Microleakage Helmholtz Coils

© 2016, Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License ( which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.
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