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Angle Orthod. 2009 May;79(3):533-9. doi: 10.2319/050508-249.1.

Forces produced by different nonconventional bracket or ligature systems during alignment of apically displaced teeth.

Author information

1
Department of Orthodontics, University of Florence, Florence, Italy.

Abstract

OBJECTIVE:

To analyze the forces released by four types of passive stainless steel self-ligating brackets (SLBs), and by two nonconventional elastomeric ligature-bracket systems when compared with conventional elastomeric ligatures on conventional stainless steel brackets during the alignment of apically displaced teeth at the maxillary arch.

MATERIALS AND METHODS:

An experimental model consisting of five brackets was used to assess the forces released by the seven different ligature-bracket systems with 0.012'' or 0.014'' superelastic nickel titanium wire in the presence of different amounts of apical displacement of the canine (ranging from 1.5 mm to 6 mm). Comparisons between the different types of bracket/wire/ ligature systems were carried out by means of ANOVA on ranks with Dunnett's post hoc test (P < .05).

RESULTS:

When correction of a misalignment greater than 3 mm is attempted, a noticeable amount of force for alignment is generated by passive SLBs and nonconventional elastomeric ligature-bracket systems, and a null amount of force is released in the presence of conventional elastomeric ligatures on conventional brackets.

CONCLUSIONS:

When minimal apical displacement is needed (1.5 mm), the differences in performance between low-friction and conventional systems are minimal. These differences become significant when correction of a misalignment of greater than 3.0 mm is attempted.

PMID:
19413392
DOI:
10.2319/050508-249.1
[Indexed for MEDLINE]

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