Journal Article

Conventionally ligated versus self-ligating metal brackets—a comparative study

C. A. Reicheneder, T. Gedrange, S. Berrisch, P. Proff, U. Baumert, A. Faltermeier and D. Muessig

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 30, issue 6, pages 654-660
Published in print December 2008 | ISSN: 0141-5387
Published online November 2008 | e-ISSN: 1460-2210 | DOI:
Conventionally ligated versus self-ligating metal brackets—a comparative study

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The purpose of this study was to compare the frictional properties of four self-ligating metal brackets, Speed, Damon 2, In-Ovation, and Time, with those of three conventionally ligated metal brackets, Time, Victory Twin, and Discovery. The self-ligating Time bracket can also be used as a conventionally ligated bracket. Friction was tested 20 times for each bracket/wire combination using a Zwick testing machine with stainless steel wires in three different wire dimensions (0.017 × 0.025, 0.018 × 0.025, and 0.019 × 0.025 inches). All brackets had a 0.022 inch slot and the prescription of an upper first premolar. The data were statistically analysed with unsigned comparisons of all bracket/wire combinations using the Mann–Whitney U-test and the Games–Howell post hoc test.

The results showed almost all brackets to have the lowest frictional force with a wire dimension of 0.018 × 0.025 inch. Friction of the self-ligating brackets using wire with a dimension of 0.018 × 0.025 inches was 45–48 per cent lower than with 0.017 × 0.025 and 0.019 × 0.025 inch wires. Friction of the conventionally ligated brackets showed a 14 per cent or less reduced friction with 0.018 × 0.025 inch wire compared with 0.017 × 0.025 and 0.019 × 0.025 inch wires. The self-ligating metal brackets showed lower frictional forces with a 0.018 × 0.025 inch wire than conventionally ligated brackets, whereas conventionally ligated brackets showed lower friction with 0.017 × 0.025 and 0.019 × 0.025 inch wire.

Friction values vary with different bracket/archwire combinations and, therefore, the choice of a bracket system for treatment should consider the correct wire dimension to produce the lowest possible frictional forces.

Journal Article.  3772 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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