Effects of temperature changes and stress loading on the mechanical and shape memory properties of thermoplastic materials with different glass transition behaviours and crystal structures

European Journal of Orthodontics
Masahiro IijimaItaru Mizoguchi

Abstract

To investigate the effects of temperature changes and stress loading on the mechanical and shape memory properties of thermoplastic materials with different glass transition behaviours and crystal structures. Five thermoplastic materials, polyethylene terephthalate glycol (Duran®, Scheu Dental), polypropylene (Hardcast®, Scheu Dental), and polyurethane (SMP MM®, SMP Technologies) with three different glass transition temperatures (T g) were selected. The T g and crystal structure were assessed using differential scanning calorimetry and X-ray diffraction. The deterioration of mechanical properties by thermal cycling and the orthodontic forces during stepwise temperature changes were investigated using nanoindentation testing and custom-made force-measuring system. The mechanical properties were also evaluated by three-point bending tests; shape recovery with heating was then investigated. The mechanical properties for each material were decreased significantly by 2500 cycles and great decrease was observed for Hardcast (crystal plastic) with higher T g (155.5°C) and PU 1 (crystalline or semi-crystalline plastic) with lower T g (29.6°C). The Duran, PU 2, and PU 3 with intermediate T g (75.3°C for Duran, 56.5°C for PU 2, and 80.7...Continue Reading

References

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Citations

Apr 1, 2016·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Kyotaro KawaguchiItaru Mizoguchi
Nov 2, 2016·The Angle Orthodontist·Luca LombardoGiuseppe Siciliani
Dec 13, 2019·Dental Materials Journal·Sayuri InoueSatoshi Imazato
Apr 4, 2021·International Journal of Environmental Research and Public Health·Alessandra PutrinoGabriella Galluccio
Jun 29, 2021·Progress in Orthodontics·Kazem DalaieSamin Ghaffari

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