Abstract
Shape memory alloys (SMAs) of Nickel–titanium (NiTi) have attractive properties for biomedical applications because of their unique characteristics such as superelasticity, and shape memory effect. Therefore, their particular mechanical properties are utilized as orthodontic archwires in the field of dentistry. While, with increasing number of orthodontic treatments using devices containing nickel, there is a growing prevalence of nickel allergy. This is based on the fact that the corrosion of NiTi causes Ni release when immersed in oral saliva. Diamond-like carbon (DLC) films have many superior properties such as extreme hardness, low friction coefficients, chemical inertness, and high-corrosion resistance. This study focuses on DLC films deposited on orthodontic archwires in order to estimate the release of Ni ions in the physiological saline. The concentrations of Ni ions were detected by microwave introduced plasma mass spectrometry (MIP-MS). The DLC coating has found to dramatically protect the Ni release. The results indicated that DLC films could be applied to the implanted dental devices such as orthodontic archwires, and artificial dentures.
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