Fretting in orthodontics and its test methods
Journal Title: Archives of Materials Science and Engineering - Year 2018, Vol 2, Issue 94
Abstract
Purpose: A review of the literature regarding the occurrence of fretting wear in orthodontics and its test methods have been presented. Design/methodology/approach: The influence of micro-movements occurring in the oral cavity on the occurrence of fretting wear in a fixed orthodontic appliance is discussed. The fretting test methods were analysed, taking into account the shape of the samples and the amplitude of the movements, calculated according to the Hertz contact problem. Fretting-corrosion tests on the wear of materials are included. Findings: Fretting occurs between the bracket and the orthodontic archwire in a fixed appliance. The test of the amount of wear material mainly uses samples created for the needs of the device. The test of ready-made components of a fixed appliance usually relate to the value of the coefficient of friction. The use of coatings increases the coefficient with the simultaneous reduction of the amount of wear material. Fretting-corrosion occurring in the oral environment has a negative impact on the wear of materials. The value of the total area of abraded material after fretting is unknown. Research limitations/implications: Particles of fretting wear get through to the organism from the elements of a fixed orthodontic appliance and they may cause hypersensitivity of surrounding tissues. The amount of wear material and its total area should be tested. Originality/value: Presented are the methods of fretting wear testing in a fixed orthodontic appliance, taking into account the cognitive gap in the knowledge of the amount of abraded material from ready-made components and the value of their total area.<br/><br/>
Authors and Affiliations
W. Czepułkowska
Keywords
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