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J Dent. 2014 Jan;42(1):1-6. doi: 10.1016/j.jdent.2013.11.010. Epub 2013 Nov 20.

The timing of significant arch dimensional changes with fixed orthodontic appliances: data from a multicenter randomised controlled trial.

Author information

1
Barts and The London School of Medicine and Dentistry, Queen Mary University of London, United Kingdom. Electronic address: padhraig.fleming@gmail.com.
2
Barts and The London School of Medicine and Dentistry, Barts Health Trust, United Kingdom.
3
Private Practice, Corfu, Greece; University of Bern, Switzerland.
4
Barts and The London School of Medicine and Dentistry, Queen Mary University of London, United Kingdom.

Abstract

OBJECTIVES:

To identify the timing of significant arch dimensional increases during orthodontic alignment involving round and rectangular nickel-titanium (NiTi) wires and rectangular stainless steel (SS). A secondary aim was to compare the timing of changes occurring with conventional and self-ligating fixed appliance systems.

METHODS:

In this non-primary publication, additional data from a multicenter randomised trial initially involving 96 patients, aged 16 years and above, were analysed. The main pre-specified outcome measures were the magnitude and timing of maxillary intercanine, interpremolar, and intermolar dimensions. Each participant underwent alignment with a standard Damon (Ormco, Orange, CA) wire sequence for a minimum of 34 weeks. Blinding of clinicians and patients was not possible; however, outcome assessors and data analysts were kept blind to the appliance type during data analysis.

RESULTS:

Complete data were obtained from 71 subjects. Significant arch dimensional changes were observed relatively early in treatment. In particular, changes in maxillary inter-first and second premolar dimensions occurred after alignment with an 0.014in. NiTi wire (P<0.05). No statistical differences in transverse dimensions were found between rectangular NiTi and working SS wires for each transverse dimension (P>0.05). Bracket type had no significant effect on the timing of the transverse dimensional changes.

CONCLUSIONS:

Arch dimensional changes were found to occur relatively early in treatment, irrespective of the appliance type. Nickel-titanium wires may have a more profound effect on transverse dimensions than previously believed.

CLINICAL SIGNIFICANCE:

On the basis of this research orthodontic expansion may occur relatively early in treatment. Nickel-titanium wires may have a more profound effect on transverse dimensions than previously believed.

KEYWORDS:

Bracket; Expansion; Orthodontic; Self-ligating

PMID:
24269833
DOI:
10.1016/j.jdent.2013.11.010
[Indexed for MEDLINE]

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