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The Chinese Journal of Dental Research

Year 2003
Volume 6 , Issue 1

Pages: 61 - 64

In Vitro Corrosion Evaluation of Magnetic Retainers

Bin Hu/Fuqiang Zhang/Yuanli Zheng

Objective: To determine whether the domestic Chinese magnetic retainer possessed any electrochemical characteristics distinguishable from that of imported ones. Methods: Three specimens were immersed in artificial saliva and were exposed for 6 months at 36.5C. This study used the polarization curve to measure self-corrosion current density and the immersion test to measure the corrosion rate. Results: In the electrochemical test, the current density of the domestic keeper was 7.015 A/cm2 and the magnet 0.119 A/cm2. In the chemical test, the corrosion rate of the domestic keeper was 3.67 x 10-5 mb/cm2h and the magnet 1.77 x 10-5 mg/cm2h. Conclusion: The resistance to corrosion of the stainless steel encapsulating magnet has no difference as compared with that of the imported ones. So, transient exposure of the stainless steel to the artificial saliva environment is likely to significantly increase elemental release. This would affect the useful life span of the magnetic retainers in the oral cavity.



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