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Randomized Controlled Trial
. 2018 May;88(3):348-354.
doi: 10.2319/061417-393.1. Epub 2018 Mar 5.

Comparison of changes in irregularity and transverse width with nickel-titanium and niobium-titanium-tantalum-zirconium archwires during initial orthodontic alignment in adolescents: A double-blind randomized clinical trial

Barrett Nordstrom, Toshihiro Shoji, W Cameron Anderson, Henry W Fields Jr, F Michael Beck, Do-Gyoon Kim, Teruko Takano-Yamamoto, Toru Deguchi
Randomized Controlled Trial

Comparison of changes in irregularity and transverse width with nickel-titanium and niobium-titanium-tantalum-zirconium archwires during initial orthodontic alignment in adolescents: A double-blind randomized clinical trial

Barrett Nordstrom et al. Angle Orthod. 2018 May.

Abstract

Objectives: The purpose of this prospective, double-blind, randomized clinical trial was to compare the clinical efficiency of nickel-titanium (NiTi) and niobium-titanium-tantalum-zirconium (TiNbTaZr) archwires during initial orthodontic alignment.

Materials and methods: All subjects (ages between 12 and 20 years) underwent nonextraction treatment using 0.022-inch brackets. All patients were randomized into two groups for initial alignment with 0.016-inch NiTi archwires (n = 14), or with 0.016-inch TiNbTaZr archwires (n = 14). Digital scans were taken during the course of treatment and were used to compare the improvement in Little's Irregularity Index and the changes in intercanine and intermolar widths.

Results: There was approximately a 27% reduction in crowding during the first month with the use of 0.016-inch TiNbTaZr (Gummetal) wire, and an additional 25% decrease in crowding was observed during the next month. There was no significant difference between the two treatment groups in the decrease in irregularity over time ( P = .29). There was no significant difference between the two groups in the changes in intercanine and intermolar width ( P = .80).

Conclusions: It can be concluded that Gummetal wires and conventional NiTi wires possess a similar ability to align teeth, and Gummetal wires have additional advantages over conventional NiTi, such as formability and use in patients with nickel allergy.

Keywords: Irregularity index; Orthodontic arch wire; Randomized clinical trial.

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Figures

Figure 1.
Figure 1.
Graph of changes in Little's Irregularity Index.
Figure 2.
Figure 2.
Graph of changes in transverse width.
See this image and copyright information in PMC

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