| A total of 60 neodymium-iron-boron sample magnets were obtained from the manufacturer. 20 PTFE-coated samples and 20 parylene-coated samples were tested for their magnetism against 20 non-coated samples before and after applying protective coating layers. Altogether 30 magnets samples were used for aging. Measurement of the strength of soaked magnets was performed and compared to the strength of control non-soaked magnets. In order to simulate an aggressive oral environment, all sample magnets were placed in a ball mill with a 'charge' of zirconia grinding media. Following ball milling, the strength of magnets was measured again and recorded. Subsequently, gel chromatography protocol was followed to test the corrosion behavior of sample magnets.; Throughout the process of coating, soaking, ball milling, and the corrosion test, the PTFE showed to be a better coating material than parylene in term of preserving magnetism strength. However, corrosion test illustrated significant evidence of metal leaching in all groups. Therefore, future in vivo study is needed to quantify the amount of potentially harmful corrosion elements and their effect on general health. |
