Mortazavi S M J, Daiee E, Yazdi A, Khiabani K, Kavousi A, Vazirinejad R, Behnejad B, Ghasemi M, Mood M Balali
Department of Medical Physics, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran.
Pak J Biol Sci. 2008 Apr 15;11(8):1142-6. doi: 10.3923/pjbs.2008.1142.1146.
In the 1st phase of this study, thirty patients were investigated. Five milliliter stimulated saliva was collected just before and after MRI. The magnetic flux density was 0.23 T and the duration of exposure of patients to magnetic field was 30 minutes. In the 2nd phase, fourteen female healthy University students who had not used mobile phones before the study and did not have any previous amalgam restorations were investigated. Dental amalgam restoration was performed for all 14 students. Their urine samples were collected before amalgam restoration and at days 1, 2, 3 and 4 after restoration. The mean +/- SD saliva Hg concentrations of the patients before and after MRI were 8.6 +/- 3.0 and 11.3 +/- 5.3 microg L(-1), respectively (p < 0.01). A statistical significant (p < 0.05) higher concentration was observed in the students used mobile phone. The mean +/- SE urinary Hg concentrations of the students who used mobile phones were 2.43 +/- 0.25, 2.71 +/- 0.27, 3.79 +/- 0.25, 4.8 +/- 0.27 and 4.5 +/- 0.32 microg L(-1) before the amalgam restoration and at days 1, 2, 3 and 4, respectively. Whereas the respective Hg concentrations in the controls, were 2.07 +/- 0.22, 2.34 +/- 0.30, 2.51 +/- 0.25, 2.66 +/- 0.24 and 2.76 +/- 0.32 microg L(-1). It appears that MRI and microwave radiation emitted from mobile phones significantly release mercury from dental amalgam restoration. Further research is needed to clarify whether other common sources of electromagnetic field exposure may cause alterations in dental amalgam and accelerate the release of mercury.
在本研究的第一阶段，对30名患者进行了调查。在MRI检查前后分别收集5毫升刺激唾液。磁通密度为0.23T，患者暴露于磁场的持续时间为30分钟。在第二阶段，对14名健康的女大学生进行了调查，这些学生在研究前未使用过手机且之前没有任何汞合金修复体。对所有14名学生进行了牙科汞合金修复。在汞合金修复前以及修复后第1、2、3和4天收集他们的尿液样本。MRI检查前后患者唾液中汞的平均浓度±标准差分别为8.6±3.0和11.3±5.3微克/升（p<0.01）。在使用手机的学生中观察到统计学上显著更高的浓度（p<0.05）。使用手机的学生在汞合金修复前以及修复后第1、2、3和4天尿液中汞的平均浓度±标准误分别为2.43±0.25、2.71±0.27、3.79±0.25、4.8±0.27和4.5±0.32微克/升。而对照组相应的汞浓度分别为2.07±0.22、2.34±0.30、2.51±0.25、2.66±0.24和2.76±0.32微克/升。似乎MRI和手机发出的微波辐射会显著促使牙科汞合金修复体释放汞。需要进一步研究以阐明其他常见的电磁场暴露源是否可能导致牙科汞合金发生变化并加速汞的释放。
