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Microleakage of Amalgam Restorations after Exposure to Electromagnetic Fields of a Commercial Hair Dryer: An Ex-Vivo Study

Document Type : Original Research

Authors

1 Oral and Dental Research Center, Oral and Maxillofacial Radiology Department, Dental Faculty, Shiraz University of Medical Sciences, Shiraz, Iran

2 Department of Oral and Maxillofacial Pathology, Biomaterial Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran

3 Department of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran

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

5 Dr. Mortazavi’s Private Clinic, Shiraz, Iran

6 Ionizing and Non-Ionizing Radiation Protection Research Center (INIRPRC), School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran

10.31661/jbpe.v0i0.2210-1551

Abstract

Background: Dental amalgam is a popular restorative material used in posterior teeth. Hair dryers can emit electromagnetic fields (EMFs) that may affect the microleakage of the amalgam-tooth interface.
Objective: The aim of this experimental study was to investigate whether the EMFs produced by commercial hair dryers could cause microleakage in amalgam restorations.
Material and Methods: In this experimental study, a total of 100 human extracted teeth without cavities were selected and prepared for class V preparations on their buccal aspects. The teeth were divided into five groups (G1–G5), each containing 20 teeth. Group 1 served as the control group and was not subjected to any treatment. Groups 2 to 5 were exposed to EMFs of a hair dryer (2000 W, 220 V, and 50 Hz). Groups 2 and 3 were exposed to “EMFs +Hot Air” for 20 min at 10 cm and 30 min at 5 cm, respectively. Groups 4 and 5 were exposed to “EMFs +Cool Air” for 20 min at 10 cm and 30 min at 5cm, respectively. After preparation, the sectioned teeth were evaluated for microleakage using dye penetration measurement.
Results: The microleakage scores showed a significant difference among the three exposure groups (G2, G3, and G5) and the control group (P=0.001, 0.002, and 0.01, respectively). However, there was no significant difference between G4 and G1. The microleakage score in G2 was higher than that in G4. 
Conclusion: This study suggests that the common use of hair dryers can lead to damage in amalgam restorations.

Highlights

Maryam Paknahad (Google Scholar)

Seyed Mahammad Javad Mortazavi (Google Scholar)

Keywords

References
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Journal of Biomedical Physics and Engineering
Volume 15, Issue 3 - Serial Number 1
71
June 2025
Pages 263-270
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