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  • Title: Forces released by nonconventional bracket or ligature systems during alignment of buccally displaced teeth.
    Author: Franchi L, Baccetti T, Camporesi M, Giuntini V.
    Journal: Am J Orthod Dentofacial Orthop; 2009 Sep; 136(3):316.e1-6; discussion 316-7. PubMed ID: 19732660.
    Abstract:
    INTRODUCTION: The aim of this study was to analyze the forces released by 4 types of passive stainless steel self-ligating brackets and 2 nonconventional elastomeric ligature bracket systems compared with conventional elastomeric ligatures on stainless steel brackets during the alignment of buccally displaced teeth. METHODS: A model consisting of 5 brackets (from second premolar through central incisor) was used to assess the forces released by the 7 bracket-ligature systems with 0.012- or 0.014-in superelastic wires with various amounts of buccal canine displacement (1.5-6.0 mm). The comparisons between the different types of bracket-wire-ligature systems were performed with 3-way ANOVA with the Tukey post-hoc test (P <0.05). RESULTS: For buccal misalignments of 1.5 and 3.0 mm, both low-friction and conventional systems released forces for bracket alignment ranging from about 30 to 160 g. For greater buccal displacements (4.5 and 6.0 mm), the low-friction systems produced a significant magnitude of force, but it dropped to 0 g for the conventional system. CONCLUSIONS: Nonconventional elastomeric ligature bracket systems produced levels of force for tooth movement that were similar to those generated by passive self-ligating brackets.
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