S M J Mortazavi - Ionizing and Non-ionizing Radiation Protection Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
A Dehghani Nazhvani - Biomaterial Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, IR Iran
M Paknahad - Oral and Dental Disease Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, IR Iran

Background: Previous studies have shown that exposure to electromagnetic fields produced by magnetic resonance imaging or mobile phones can lead to increased microleakage of dental amalgam. Objective: The aim of the present study was to investigate the effect of electromagnetic field of a commercial dental light cure device and a common GSM mobile phone on microleakage of amalgam restorations.Materials and Methods: Identical class V cavities were prepared on the buccal surfaces of ۶۰ non-carious extracted human teeth. The samples were randomly divided into ۴ groups of ۲۰ samples each. The samples in the first group were not exposed to electromagnetic fields, while the second and the third groups were exposed to electromagnetic fields produced by a commercial light cure device, or mobile phone radiation (۶۰ min), respectively. The fourth group was exposed to electromagnetic radiations emitted by both mobile phone for ۶۰ min and light cure device. Then, teeth samples were scored for microleakage according to a standard dye penetration protocol by examination under a stereomicroscope.Results: The mean score of microleakage in the fourth group (light cure + mobile phone) was significantly higher than that of the control group (P =۰.۰۳۰). Moreover, the scores of microleakage in this group were significantly higher than that of the second group (light cure only) (P= ۰.۰۴۳). Conclusion: Exposure of amalgam restorations to electromagnetic fields produced by both light cure devices and mobile phones can synergistically increase the microleakage of amalgam restorations.

Light Cure Device, Amalgam, Microleakage, Electromagnetic Radiation, Mobile Phones