An Evaluation of 55 Cobalt Substituted Nitinol Wire for Use in Orthodontics

Andreasen, George F.; Hilleman, Terry B.

doi:10.14219/jada.archive.1971.0209

Cited by 242 publications

(99 citation statements)

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“…At the same time, when deformed wire rebounds, the stress value again remains fairly constant. 3 Since the development of Ni-Ti alloy wire for orthodontic appliances in 1971, 4 this wire has been used widely in orthodontic treatment. 3,5,6 In orthodontic treatment, optimal force produces efficient tooth movement without discomfort to the pa- tient or causing tissue damage.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…The first application of NiTi in the biomedical field dates back to 1975 when Dr. Andreasen from Iowa University made the first implantation of an orthodontic device exploiting the pseudoelastic property of the alloy [19]. NiTi wires, which are in austenitic phase at the temperature of the buccal cavity, have been successfully used for years in fixed orthodontic treatment with multibrackets [20], Figure 7.…”

Section: Sma Applications In the Orthodontic Fieldmentioning

confidence: 99%

Biomedical Applications of Shape Memory Alloys

Petrini

Migliavacca

2011

Journal of Metallurgy

465

200

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Shape memory alloys, and in particular NiTi alloys, are characterized by two unique behaviors, thermally or mechanically activated: the shape memory effect and pseudo-elastic effect. These behaviors, due to the peculiar crystallographic structure of the alloys, assure the recovery of the original shape even after large deformations and the maintenance of a constant applied force in correspondence of significant displacements. These properties, joined with good corrosion and bending resistance, biological and magnetic resonance compatibility, explain the large diffusion, in the last 20 years, of SMA in the production of biomedical devices, in particular for mini-invasive techniques. In this paper a detailed review of the main applications of NiTi alloys in dental, orthopedics, vascular, neurological, and surgical fields is presented. In particular for each device the main characteristics and the advantages of using SMA are discussed. Moreover, the paper underlines the opportunities and the room for new ideas able to enlarge the range of SMA applications. However, it is fundamental to remember that the complexity of the material and application requires a strict collaboration between clinicians, engineers, physicists and chemists for defining accurately the problem, finding the best solution in terms of device design and accordingly optimizing the NiTi alloy properties.

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“…Following the pioneering work of Andreasen and his colleagues [35,36], near-equiatomic nickel-titanium (NiTi) wire was introduced to orthodontics by the Unitek Corporation (now 3M Unitek) [37]. This wire had the advantages of a much lower elastic modulus than the stainless steel and cobalt-chromium wires available at the time and a very large elastic range.…”

Section: Nickel-titanium Orthodontic Wiresmentioning

confidence: 99%