Experimental performance and economic evaluation of a thermoelectric liquefied petroleum gas (Te-LPG) cook stove
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Author list: Lertsatitthanakorn C., Bamroongkhan P., Sathapornprasath K., Soponronnarit S.
Publisher: Elsevier
Publication year: 2019
Journal: International Orthodontics (1761-7227)
Volume number: 37
Issue number: 2
Start page: 575
End page: 582
Number of pages: 8
ISSN: 1761-7227
Languages: English-Great Britain (EN-GB), French-France (FR-FR)
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Abstract
Objectives: The aim of this investigation was (1) to compare the effects of cold-hardening bending and direct electric resistance heat treatment (DERHT) methods; and (2) to compare the effects of offsets and angulations on the mechanical properties and thermal analysis of NiTi alloy archwire. Methods: Nickel-titanium (NiTi) archwires (Ormco, Glendora, CA), 0.016 × 0.022-inch, were bent by cold-hardening bending and DERHT methods into 1-mm, 2-mm, or 3-mm offset for a 3-point bending test, and at angles of 30°, 45°, or 60° to the horizontal plane for testing the change in transformation temperature (Af) measured by differential scanning calorimetry (DSC). The data were analysed using ANOVA followed by the Scheffe post-hoc test. Results: The 3-point bending test results of the cold-hardening bending and DERHT methods were not significantly different between the 1-mm, 2-mm and 3-mm offset groups (95% CI: −0.05 to 0.97; P = 0.082, 95% CI: −0.65 to 0.74; P = 0.983 and 95% CI: −0.61 to 0.98; P = 0.813, respectively). Increasing the offset resulted in a significantly decreased force in the 3-point bending test (P < 0.001). The Af temperatures of the cold-hardening bending and DERHT methods were not significantly different for the 30°, 45°, and 60° bending angulations (95% CI: −1.93 to 1.39; P = 0.876, 95% CI: −1.2 to 0.87; P = 0.878, 95% CI: −2.24 to 1.18; P = 0.636, respectively). Af temperatures were not influenced by different bending angulations. Conclusions: NiTi archwire shape can be modified by using both cold-hardening and DERHT bending methods, because the mechanical properties and Af temperature are not affected. However, the bending distance has an effect on the mechanical properties. © 2019 CEO
Keywords
Cold-hardening bending method, Direct electric resistance heat treatment method
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