Effect of magnetic resonance imaging on microleakage of amalgam restorations: an<i>in vitro</i>study

Shahidi, Shoaleh; Bronoosh, Pegah; Alavi, Ali Asghar; Zamiri, Bardia; Sadeghi, Alireza; Bagheri,; Javadpour, Sirus

doi:10.1259/dmfr/30077669

Cited by 39 publications

(50 citation statements)

References 18 publications

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“…Therefore, similar to the previous studies, we have used common visual microleakage scale for evaluation of microleakage. It is worth mentioning that a blot-like dye penetration along dentinal tubules was observed in this study which was similar to the pattern observed by Shahidi et al in our previous study (12) . However, Yilmaz and Misirlioglu have observed a linear dye penetration pattern (14) .…”

Section: Discussionsupporting

confidence: 92%

“…Furthermore, there are only a few studies which examined the effect of MRI on the microleakage of amalgam restorations (12)(13)(14) . While the results of two out of three of these studies suggest that MRI is not a completely safe technique in patients with amalgam restorations, Okgun et al concluded that MRI does not increase microleakage of amalgam restorations.…”

Section: Discussionmentioning

confidence: 99%

“…However, dye penetration test is a simple, inexpensive and qualitative method. However, as mentioned by Shahidi et al more accurate techniques such as measuring the penetration of ammoniac silver nitrate between the tooth structure and amalgam could be more precise (12) . Therefore, similar to the previous studies, we have used common visual microleakage scale for evaluation of microleakage.…”

Section: Discussionmentioning

confidence: 99%

“…From the other point of view, we have also shown that papers which reported no increased release of mercury after MRI, may have some methodological laws (11) . On the other hand, other investigators and our team have previously evaluated the impact of MRI on microleakage of amalgam restorations (12)(13)(14)(15) . Over the past several years, our laboratories have expanded their focus on studying the health effects of exposure to some common and/ or occupational sources of electromagnetic ields (EMFs) such as cellular phones, mobile base stations, mobile phone jammers, laptop computers, radars, dentistry cavitron (16) .…”

Section: Introductionmentioning

confidence: 99%

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Increased Mercury release due to exposure to electromagnetic radiation as a limiting factor for using dental amalgam

Paknahad

Dehghani

Jarideh

et al. 2016

IJRR

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Background:Although it is one of the most toxic nonradioac ve elements, mercury is widely used in dental amalgam. Mercury is a toxic element which can damage various organs such as central nervous system, renal, respiratory and hematologic systems. The adverse health impacts associated to exposure to some common sources of electromagne c fields including laptop computers, mobile phones, MRI and mobile phone jammers have been evaluated by our laboratory in our previous inves ga ons. In this study, we aimed to evaluate the effect of X ray exposure on microleakage of amalgam restora on. Materials and Methods: Standardized class V cavi es were prepared on the buccal surfaces of 46 non-carious freshly extracted human premolars. The teeth were randomly divided into experimental and control groups. Experimental group were exposed to X-ray using an intraoral radiography machine at 60 kVp, 0.1 s, 7 mA with 2.5 mm Al total filtra on. The absorbed dose was 245.0 ± 0.5 µGy. All specimens were placed in 2 % basic fuchsin solu on for 24 hours. Then the specimens were sec oned and microleakage was assessed according to dye penetra on using a stereomicroscope. Sta s cal analysis was performed with the Mann-Whitney U-test. Results: Microleakage was significantly higher in the X-ray exposed teeth compared to those of the non-irradiated samples. Conclusion: The results of the present study suggest that X-ray exposure increased microleakage of amalgam restora ons.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Increased Mercury release due to exposure to electromagnetic radiation as a limiting factor for using dental amalgam

Paknahad

Dehghani

Jarideh

et al. 2016

IJRR

View full text Add to dashboard Cite

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“…In other research finding, the mercury released from dental amalgams was significant in patients' saliva and urine samples after being exposed to magnetic MRI fields (0.23T), and mobile devices [22]. The effect of magnetic fields emitted from MRI with identical conditions on teeth restored with different commercial amalgams showed different microleakages of mercury in vitro conditions (where human teeth were studied in artificial saliva) [23]. Briefly after, the role of MRI irradiation (1.5T) in the release of mercury in the urine of students with restored teeth was reported [24].…”

Section: Introductionmentioning

confidence: 82%

The Assessment of Mercury Released from Dental Amalgams after Exposure to Wi-Fi and X-Ray Radiation in Artificial Saliva

Hosseini¹,

Mehdizadeh²,

Sanipour³

et al. 2018

Eurasian J Anal Chem

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Mercury is a well-known toxic element that is found in various forms in nature. Recently, dental amalgams have been recognized as a new source of mercury. This study was carried out under in vitro condition; the amount of mercury released from teeth restored with amalgams in the presence of Wi-Fi router radiation (non-ionizing radiation) and X-ray (ionizing radiation) using a protocol similar to Computed Tomography of Para-nasal Sinuses (CT) were analyzed separately, and in combination on the samples. For this reason, 50 human premolars were restored with a certain type of commercial amalgams. The samples were divided into five groups; control, only-CT, CT+Wi-Fi, Wi-Fi+CT and only-Wi-Fi groups, and mercury measurement were investigated at 24 and 48 hours after exposure to radiation by cold-vapor atomic absorption system. The results showed a significant difference between subgroups 24 and 48 h (p-values = 0.001 and 0.008). However, over time a significant difference was only found in CT+Wi-Fi group (p-value = 0.043). In addition, in comparison with the control group, only the subgroup that was exposed to Wi-Fi waves showed a significant difference after 24 hours (p = 0.033). In line with some of the previous studies, our findings showed that electromagnetic waves are involved in mercury release process, and warnings about the consequences of electromagnetic waves on mercury release and subtitling it with a new compound in restorative dentistry should be taken into consideration.

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The effect of 1.5 T and 3 T magnetic resonance imaging on microleakage of amalgam restorations

et al. 2019

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The aim of this article is to compare the effects of 1.5 T and 3 T MRI on microleakage of amalgam restorations. A total of 90 extracted molar teeth were used in this study. Amalgam was used to restore standard Class V preparations (5 × 3 × 2 mm). Following the restoration, the teeth were divided into three groups according to magnetic resonance imaging (MRI) protocol (Group I: Control, Group II: 1.5 T MRI, and Group III: 3 T MRI). A total of 6,000 thermal cycles at 5°C–55°C were applied on all samples. Microleakage values were measured in millimeters using the ImageJ program. Microleakage values were higher in the gingival region compared to the occlusal region in all groups and the differences were statistically significant (p < .05). Microleakage values were not statistically different among the groups in the occlusal region (p > .05), while there were statistically significant differences among the groups with respect to microleakage values in the gingival region (p < .01). The highest mean microleakage amount in the gingival region was measured in Group III (1.192 ± 0.941 mm). This was followed by Group II (0.519 ± 0.813 mm) and Group I (0.347 ± 0.726 mm), respectively. Within the limitations of this in vitro study, we observed that higher microleakage values in amalgam restored teeth in which were exposed to MRI procedure. We also found that the teeth exposed to the stronger magnetic field showed higher microleakage amount.

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Effect of magnetic resonance imaging on microleakage of amalgam restorations: anin vitrostudy

Cited by 39 publications

References 18 publications

Increased Mercury release due to exposure to electromagnetic radiation as a limiting factor for using dental amalgam

Increased Mercury release due to exposure to electromagnetic radiation as a limiting factor for using dental amalgam

The Assessment of Mercury Released from Dental Amalgams after Exposure to Wi-Fi and X-Ray Radiation in Artificial Saliva

The effect of 1.5 T and 3 T magnetic resonance imaging on microleakage of amalgam restorations

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