Abstract
The aim. The development of methodology for experimental and theoretical assessment of interaction forces between magnets in an orthodontic apparatus, the test of corrosion resistance of protective oxide and nitride coatings deposited on Nd-Fe-B magnets surface. Materials and methods. The Nd-Fe-B permanent magnets with saturation magnetization Ms≈1100 G and bilayer ZrN / ZrO2 coatings were used. To experimental measure of interaction forces between magnets the device was assembled on the base of analytical balance. The distance between the magnets was varied using non-magnetic plates. The ZrO2 and ZrN coatings have been analyzed for their corrosion properties in 0.9 % NaCl quasi-physiological solution. Results. An original method was proposed for calculating of magnetic interaction forces for materials with high magnetic anisotropy, which has good agreement with experimental measurement of forces. The theoretical model takes into account the size of the magnets and the mutual influence of their opposite faces. An increase of corrosion resistance of magnetic materials can be provided by zirconium oxide or nitride compounds, which contribute to inhibition of electrochemical corrosion of Nd-Fe-B magnets. Conclusions. A method for calculating of interaction forces between permanent magnets, which are used for correction of malocclusion in orthodontic, has been developed. The passivation of the Nd-Fe-B permanent magnets surface can be achieved by applying of bilayer ZrN / ZrO2 coating.
Highlights
Anomalies in dentition structure require orthodontic treatment to achieve a higher aesthetics and functionality
The interaction force between the magnets is defined as a gradient of their magnetostatic interaction energy W:
Nd-Fe-B magnets showed that modern materials science technologies make it possible to produce magnets of required size, comparable with the size of braces-locks, providing the necessary forces for various tooth movements for correcting of malocclusion
Summary
Anomalies in dentition structure require orthodontic treatment to achieve a higher aesthetics and functionality. Correction of bite pathologies is carried out using bracket systems in most cases [1, 2]. This treatment is long and requires careful observance of oral hygiene. There is another way to correct orthodontic pathologies – the use of devices with magnets [3, 4]. Such devices have several advantages: mechanical transfer of force without friction; predictable magnitude of force; high stability of parameters of modern magnetic materials; easier tooth brushing due to a significant simplification of the device design [5]. The magnetic stimulation can significantly reduce the duration of orthodontic treatment [6, 7]
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