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. 2021 Jun;34(2):127-135.
doi: 10.5152/TurkJOrthod.2021.20084.

Alleviation of Lower Anterior Crowding with Super- Elastic and Heat-Activated NiTi Wires: A Prospective Clinical Trial

Pasupureddi Keerthana  1 , Prasad Chitra  1
Affiliations

Alleviation of Lower Anterior Crowding with Super- Elastic and Heat-Activated NiTi Wires: A Prospective Clinical Trial

Pasupureddi Keerthana et al. Turk J Orthod. 2021 Jun.

Abstract

Objective: To compare the amount of alleviation of lower anterior crowding and changes in intercanine width (ICW), intermolar width (IMW), and arch depth (AD) dimensions using 2 different types of nickel-titanium (NiTi) archwires.

Methods: Thirty participants were randomly allocated to 2 treatment groups, using heat-activated NiTi (HANT) or super-elastic (SE-NiTi) round (0.014") archwires. The inclusion criteria were a Little's Irregularity Index (LII) greater than 4, malocclusion requiring non-extraction therapy, all teeth erupted to the second molars in the lower arch, and Angle's Class I malocclusion. The primary aim was to measure alleviation in mandibular crowding over 12 weeks; the secondary aim was to measure changes in ICW, IMW, and AD during those 12 weeks. Simple randomization was performed. The measurements were made on dental stone casts using a coordinate measuring machine at 4-week intervals.

Results: LII at 0, 4, 8, and 12 weeks was 8.59 ± 1.44, 6.17 ± 1.65, 4.65 ± 1.63, and 3.28 ± 1.57 mm in the HANT; 8.87 ± 1.29, 6.92 ± 1.49, 5.25 ± 1.32, and 3.63 ± 1.32 mm in the SE-NiTi group, respectively. ICW increased from 25.43 ± 1.39 to 27.41 ± 1.29 mm in the HANT and from 25.81 ± 1.78 to 27.27 ± 1.83 mm in the SE-NiTi groups over a period of 12 weeks, at P < .05. There was a statistically significant increase in IMW, CAD (canine arch depth), and MAD (molar arch depth), favoring the HANT group (P < .05). No significant differences in LII between the 2 groups were noted (P > .05).

Conclusions: The amount of alleviation of lower anterior crowding was similar with both archwires. ICW, IMW, and AD increased with HANT archwires.

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Conflict of interest statement

Conflict of Interest: The authors have no conflict of interest to declare.

Figures

Figure 1.
Figure 1.
(A-D) Alignment at every 4-week interval using heat-activated NiTi; (E-H) Alignment at every 4-week interval using super-elastic NiTi.
Figure 2.
Figure 2.
Dental stone models obtained at every 4-week interval.
Figure 3.
Figure 3.
Mandibular measurements: Little’s irregularity index, intercanine width, and intermolar width and arch depth.
Figure 4.
Figure 4.
Coordinate measuring machine (Explorer Performance, Hexagon Manufacturing Intelligence, Stockholm, Sweden).
Figure 5.
Figure 5.
CONSORT flow diagram.
See this image and copyright information in PMC

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