Effects of reversing the coiling direction on the force-deflection characteristics of nickel-titanium closed-coil springs

Authors
Park, Hwan-HyungJung, Suk-HwanYoon, JuilJee, Kwang KooHan, Jun HyunBaek, Seung-Hak
Issue Date
2019-07
Publisher
KOREAN ASSOC ORTHODONTISTS
Citation
KOREAN JOURNAL OF ORTHODONTICS, v.49, no.4, pp.214 - 221
Abstract
Objective: To investigate the effects of reversing the coiling direction of nickel-titanium closed-coil springs (NiTi-CCSs) on the force-deflection characteristics. Methods: The samples consisted of two commercially available conventional NiTi-CCS groups and two reverse-wound NiTi-CCS groups (Ormco-Conventional vs. Ormco-Reverse; GAC-Conventional vs. GAC-Reverse; n = 20 per group). The reverse-wound NiTi-CCSs were directly made from the corresponding conventional NiTi-CCSs by reversing the coiling direction. Tensile tests were performed for each group in a temperature-controlled acrylic chamber (37 +/- 1 After measuring the force level, the range of the deactivation force plateau (DFP) and the amount of mechanical hysteresis (MH), statistical analyses were performed. Results: The Ormco-Reverse group exhibited a significant shift of the DFP end point toward the origin point (2.3 to 0.6 mm), an increase in the force level (1.2 to 1.3 N) and amount of MH (1.0 to 1.5 N) compared to the Ormco-Conventional group (all p < 0.001), which indicated that force could be constantly maintained until the end of the deactivation curve. In contrast, the GAC-Reverse group exhibited a significant shift of the DFP-end point away from the origin point (0.2 to 3.3 mm), a decrease in the force level (1.1 to 0.9 N) and amount of MH (0.6 to 0.4 N) compared to the GAC-Conventional group (all p < 0.001), which may hinder the maintenance of force until the end of the deactivation curve. Conclusions: The two commercially available NiTi-CCS groups exhibited different patterns of change in the force-deflection characteristics when the coiling direction was reversed.
Keywords
NITI ALLOY WIRE; Nickel-titanium closed-coil spring; Range of the force plateau; Force-deflection characteristics; Reversing the coiling direction
ISSN
2234-7518
URI
https://pubs.kist.re.kr/handle/201004/119838
DOI
10.4041/kjod.2019.49.4.214
Appears in Collections:
KIST Article > 2019
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