Force delivery of NiTi orthodontic arch wire at different magnitude of deflections and temperatures: A finite element study
Autor: | M. F. Razali, Norehan Mokhtar, Abdus Samad Mahmud |
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Rok vydání: | 2018 |
Předmět: |
Dental Stress Analysis
Materials science Finite Element Analysis Biomedical Engineering 02 engineering and technology Biomaterials 03 medical and health sciences 0302 clinical medicine Nickel Deflection (engineering) Tensile Strength Materials Testing Ultimate tensile strength Orthodontic Wires Composite material Arch Mechanical Phenomena Titanium business.industry Bracket Temperature 030206 dentistry Structural engineering Shape-memory alloy Models Theoretical 021001 nanoscience & nanotechnology Elasticity Finite element method Mechanics of Materials Nickel titanium Diffusionless transformation Stress Mechanical 0210 nano-technology business Dental Alloys |
Zdroj: | Journal of the Mechanical Behavior of Biomedical Materials. 77:234-241 |
ISSN: | 1751-6161 |
Popis: | NiTi arch wires are used widely in orthodontic treatment due to its superelastic and biocompatibility properties. In brackets configuration, the force released from the arch wire is influenced by the sliding resistances developed on the arch wire-bracket contact. This study investigated the evolution of the forces released by a rectangular NiTi arch wire towards possible intraoral temperature and deflection changes. A three dimensional finite element model was developed to measure the force-deflection behavior of superelastic arch wire. Finite element analysis was used to distinguish the martensite fraction and phase state of arch wire microstructure in relation to the magnitude of wire deflection. The predicted tensile and bending results from the numerical model showed a good agreement with the experimental results. As contact developed between the wire and bracket, binding influenced the force-deflection curve by changing the martensitic transformation plateau into a slope. The arch wire recovered from greater magnitude of deflection released lower force than one recovered from smaller deflection. In contrast, it was observed that the plateau slope increased from 0.66N/mm to 1.1N/mm when the temperature was increased from 26°C to 46°C. |
Databáze: | OpenAIRE |
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