Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 77, Issue -, Pages 234-241Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmbbm.2017.09.021
Keywords
Bending; Leveling; Binding; Bracket friction; Shape memory alloy
Funding
- Universiti Sains Malaysia [RUI 1001/PMEKANIK/814244]
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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 0.66 N/nun to 1.1 N/mm when the temperature was increased from 26 degrees C to 46 degrees C.
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