Highlights
- •Modified aligner appliances with nickel titanium springs (MAAs) were effective in lower incisor decrowding.
- •Using MAAs did not significantly reduce alignment duration.
- •Using MAAs increased the alignment improvement percentage in the first 6 weeks of treatment.
- •Using MAAs decreased the amount of change in the lower incisor proclination after treatment.
ABSTRACT
Background
This study aimed to evaluate the effectiveness of modified aligner appliances with
nickel-titanium springs (MAAs) in treating mild mandibular crowding and assess the
overall alignment treatment duration, alignment improvement percentage, and mandibular
incisor proclination.
Methods
This two-armed, parallel-group randomized controlled trial included 36 patients (7
men, 29 women) with mild mandibular incisor crowding according to Little's Irregularity
Index. Patients were randomly assigned to two groups: the MAA group (mean age = 22.56
± 3.50 years) and the conventional fixed bracket group (control group; mean age = 20.89
± 2.90 years). The duration of alignment treatment of the lower anterior teeth was
calculated. The progress of alignment was evaluated every 2 weeks on the study casts,
which were taken at fixed intervals: pretreatment (T0) and 2 (T1), 4 (T2), 6 (T3),
and 8 (T4) weeks after beginning the treatment. Change of mandibular incisor proclination
was evaluated by measuring and comparing pretreatment and postalignment lateral cephalograms.
Results
No statistically significant difference was detected between the two groups in terms
of alignment treatment duration (P = 0.097), whereas a significant difference was observed in the alignment improvement
percentage at T1 (P = 0.000), T2 (P = 0.001), and T3 (P = 0.022). In addition, the MAA group had a lower change of mandibular incisor proclination
than the control group (P = 0.000).
Conclusions
The clinical application of MAAs may be effective in lower incisor decrowding, with
a reduction in lower incisor inclination compared with conventional fixed brackets.
This trial was registered at ClinicalTrials.gov (identifier: NCT04988373).
Keywords
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Article info
Publication history
Published online: May 24, 2022
Accepted:
April 27,
2022
Received in revised form:
April 7,
2022
Received:
March 1,
2022
Footnotes
Funding: The authors have not declared a specific grant for this research from any funding agency in the public, commercial, or not-for-profit sectors.
Competing interests: Authors have completed and submitted the ICMJE Form for Disclosure of potential conflicts of interest. None declared.
Provenance and peer review: Non-commissioned and externally peer reviewed.
Identification
Copyright
© 2022 World Federation of Orthodontists. Published by Elsevier Inc. All rights reserved.
