synergistic effect of radiofrequency electromagnetic fields of dental light cure devices and mobile phones accelerates the microleakage of amalgam restorations: an in vitro study

Background: previous studies have shown that exposure to electromagneticfields produced by magnetic resonance imaging or mobile phones can lead to increasedmicroleakage of dental amalgam.objective: the aim of the present study was to investigate the effect of electromagneticfield of a commercial dental light cure device and a common gsm mobilephone on microleakage of amalgam restorations.materials and methods: identical class v cavities were prepared on thebuccal surfaces of 60 non-carious extracted human teeth. the samples were randomlydivided into 4 groups of 20 samples each. the samples in the first group were not exposedto electromagnetic fields, while the second and the third groups were exposedto electromagnetic fields produced by a commercial light cure device, or mobilephone radiation (60 min), respectively. the fourth group was exposed to electromagneticradiations emitted by both mobile phone for 60 min and light cure device. then,teeth samples were scored for microleakage according to a standard dye penetrationprotocol by examination under a stereomicroscope.results: the mean score of microleakage in the fourth group (light cure + mobilephone) was significantly higher than that of the control group (p =0.030). moreover,the scores of microleakage in this group were significantly higher than that of thesecond group (light cure only) (p= 0.043).conclusion: exposure of amalgam restorations to electromagnetic fields producedby both light cure devices and mobile phones can synergistically increase themicroleakage of amalgam restorations.