Geometric morphometric evaluations of a randomized prospective split-mouth study on modes of ligation and reverse-curve mechanics

A. G. Celar, K. Onodera, M. H. Bertl, E. Astl, H. -P. Bantleon, S. Sato, P. Mitteroecker

    Publications: Contribution to journalArticlePeer Reviewed

    Abstract

    Structured Abstract: Objectives: To evaluate tooth position after six and 9 months of orthodontics with conventional brackets on one side of the dentition and ligature-less brackets on the other. Setting and sample population: Orthodontic Division, Vienna Medical University. Twenty patients aged 22.5 ± 5.7 years, symmetrical malocclusion and arch form, no premolar extraction. Material and Methods: Prospective split-mouth study, 0.022-inch SmartClip self-ligating brackets assigned randomly to the left or right dentition, conventional 0.018-inch brackets on the other side. 52 dental landmarks, digitized on plaster casts, represented dental arches at baseline (t 0), 6 months and 9 months (t 1, t 2). During t 0-t 1, we used 0.016 and 0.014 x 0.025 inch superelastic wires, during t 1-t 2 connected reverse-curve hemiarch wires: 0.017 x 0.025 inch ß-titanium on the ligature-less side, and 0.016 x 0.022 inch Elgiloy multiloop wires on conventional brackets. Morphometric analyses were used to assess differences in dental arch shapes. Results: Neither initial alignment nor the reverse-curve phase showed statistically significant differences between ligature-less and conventional brackets in moving teeth. Conclusion: Morphometric shape analyses corroborated current evidence that self-ligating brackets were no more effective than conventional brackets with steel ligatures after 6-month initial alignment. From months 6-9 treatment with ß-titanium reverse-curve wires on 0.022-inch ligature-less brackets resulted in similar tooth positions as accomplished by Elgiloy multiloop wires on 0.018-inch steel-ligature-tied brackets.

    Original languageEnglish
    Pages (from-to)158-169
    Number of pages12
    JournalOrthodontics & Craniofacial Research
    Volume17
    Issue number3
    DOIs
    Publication statusPublished - Aug 2014

    Austrian Fields of Science 2012

    • 302034 Orthodontics
    • 106007 Biostatistics

    Keywords

    • geometric morphometrics
    • principal component analysis
    • reverse curve
    • self-ligation
    • split mouth
    • ORTHODONTIC TREATMENT EFFICIENCY
    • MULTILOOP EDGEWISE ARCHWIRE
    • CONVENTIONAL TWIN BRACKETS
    • CLASS-III MALOCCLUSION
    • CLINICAL-TRIAL
    • ANTERIOR OPENBITE
    • INITIAL ALIGNMENT
    • APPLIANCES
    • 0.018-INCH
    • RESISTANCE
    • Split mouth
    • Geometric morphometrics
    • Self-ligation
    • Reverse curve
    • Principal component analysis

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