Laboratory and clinical analyses of nitinol wire

Andreasen, George F.; Morrow, Ray E.

doi:10.1016/0002-9416(78)90184-7

Cited by 207 publications

(94 citation statements)

References 5 publications

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“…18,37,38 Moreover, the use of this alloy in place of NiTi may have clinical advantages for patients such as the extension of treatment intervals and the reduction of pain and invasiveness for periodontal tissue through the use of lighter force. 39 …”

Section: Clinical Advantagesmentioning

confidence: 99%

Orthodontic Buccal Tooth Movement by Nickel-Free Titanium-Based Shape Memory and Superelastic Alloy Wire

Suzuki

Kanetaka

Shimizu

et al. 2006

The Angle Orthodontist

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Objective: To examine the mechanical properties and the usefulness of titanium-niobium-aluminum (Ti-Nb-Al) wire in orthodontic tooth movement as compared with nickel-titanium (Ni-Ti) wire. Materials and Methods: The load deflection of expansion springs was gauged with an original jig. The gradient of the superelastic region was measured during the unloading process. Expansion springs comprising the two types of alloy wires were applied to upper first molars of rats. The distance between the first molars was measured with micrometer calipers. Results: The force magnitude of the Ti-Nb-Al expansion spring was lower than that of the Ni-Ti expansion spring over the entire deflection range. The initial force magnitude and the gradient in the superelastic region of the Ti-Nb-Al expansion springs were half those of the Ni-Ti expansion springs. Thus, Ti-Nb-Al expansion springs generated lighter and more continuous force. Tooth movement in the Ni-Ti group proceeded in a stepwise fashion. On the other hand, tooth movement in the Ti-Nb-Al group showed relatively smooth and continuous progression. At 17 days after insertion of expansion springs, there were no significant differences between the Ti-Nb-Al and NiTi groups in the amount of tooth movement. Conclusions:These results indicate that Ti-Nb-Al wire has excellent mechanical properties for smooth, continuous tooth movement and suggest that Ti-Nb-Al wire may be used as a practical nickel-free shape memory and superelastic alloy wire for orthodontic treatment as a substitute for Ni-Ti wire.

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Section: Clinical Advantagesmentioning

confidence: 99%

Orthodontic Buccal Tooth Movement by Nickel-Free Titanium-Based Shape Memory and Superelastic Alloy Wire

Suzuki

Kanetaka

Shimizu

et al. 2006

The Angle Orthodontist

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“…Although many authors have investigated the properties of NiTi archwires, [4][5][6][7] most published studies have tended to concentrate on evaluating the force exerted by various wires at specific deflections and have considered their complete behavior during the discharge phase in just a few cases. 8 The aim of the present study, therefore, was to investigate the characteristics of the aforementioned plateau phase occurring during discharge, described using three parameters: the average plateau force, the plateau length, and the plateau slope.…”

Section: Introductionmentioning

confidence: 99%

Load deflection characteristics and force level of nickel titanium initial archwires

Lombardo

Marafioti

Stefanoni

et al. 2012

The Angle Orthodontist

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Objectives: To investigate and compare the characteristics of commonly used types of traditional and heat-activated initial archwire by plotting their load/deflection graphs and quantifying three suitable parameters describing the discharge plateau phase. Materials and Methods: Forty-eight archwires (22 nickel titanium [NiTi] and 26 heat-activated) of cross-sectional diameter ranging from 0.010 to 0.016 inch were obtained from seven different manufacturers. A modified three-point wire-bending test was performed on three analogous samples of each type of archwire at a constant temperature (37.0uC). For each resulting load/ deflection curve, the plateau section was isolated, along with the mean value of the average plateau force, the plateau length, and the plateau slope for each type of wire obtained. Results: Statistically significant differences were found between almost all wires for the three parameters considered. Statistically significant differences were also found between traditional and heat-activated archwires, the latter of which generated longer plateaus and lighter average forces. The increase in average force seen with increasing diameter tended to be rather stable, although some differences were noted between traditional and heat-activated wires. Conclusions: Although great variation was seen in the plateau behavior, heat-activated versions appear to generate lighter forces over greater deflection plateaus. On average, the increase in plateau force was roughly 50% when the diameter was increased by 0.002 inch (from 0.012 to 0.014 and from 0.014 to 0.016 inch) and about 150% when the diameter was increased by 0.004 inch (from 0.012 to 0.016), with differences between traditional and heat-activated wires noted in this case. (Angle Orthod. 2012;82:507-521.)

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“…In addition to memory properties, good mechanical compatibility with tissues, excellent corrosion resistance, wear resistance, and superelastic property are other important properties. [1][2][3][4] Good biocompatibility to living tissue is supported by the titanium oxide layer on surface. However, allergic reactions have been reported after insertion of NiTi orthodontic wire.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the effect of fluoride‐containing acetic acid on NiTi wires

Kwon¹,

Cho²,

Noh³

et al. 2004

J Biomed Mater Res

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The possibility of the formation of hydrofluoric acid by the reaction of fluoride with acetic acid seems natural in the oral cavity. The effect of an acidic fluoride solution on NiTi wires was investigated by testing microhardness and color changes on wires. For aesthetic reasons, the color change on wires was also evaluated. Wires were immersed in four different test solutions for 1 or 3 days. As-received wires were used as a reference. After immersion for 3 days, the microhardness of the tested wires increased 1.8% to 10.4% compared to that of their as-received state. Wires immersed in a higher NaF concentration, lower pH solution with longer immersion yielded a more corroded surface than those of the counter cases. Wires showed a different color after immersion. However, after 3 days in solutions of pH 4, wires showed an appreciable color change regardless of the products. In test solutions, 3M wires showed the highest volumetric and percentage (0.59 for 0.05%; 1.19 for 0.2% solution) weight loss and G&H wires showed the least volumetric and percentage (0.43 for 0.05%; 1.05 for 0.2% solution) weight loss among tested wires. In pH 6 solutions, wires lost weight and were under the detection limit of the testing machine.

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Laboratory and clinical analyses of nitinol wire

Cited by 207 publications

References 5 publications

Orthodontic Buccal Tooth Movement by Nickel-Free Titanium-Based Shape Memory and Superelastic Alloy Wire

Orthodontic Buccal Tooth Movement by Nickel-Free Titanium-Based Shape Memory and Superelastic Alloy Wire

Load deflection characteristics and force level of nickel titanium initial archwires

Evaluation of the effect of fluoride‐containing acetic acid on NiTi wires

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