Journal Article

Comparison of self- and conventional-ligating brackets in the alignment stage

Rohaya Megat Abdul Wahab, Hartini Idris, Habibah Yacob and Shahrul Hisham Zainal Ariffin

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 34, issue 2, pages 176-181
Published in print April 2012 | ISSN: 0141-5387
Published online April 2011 | e-ISSN: 1460-2210 | DOI:
Comparison of self- and conventional-ligating brackets in the alignment stage

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This prospective study investigated the difference in clinical efficiency between Damon™ 3 self-ligating brackets (SLB) compared with Mini Diamond conventional ligating brackets (CLBs) during tooth alignment in straightwire fixed appliance therapy.

Twenty-nine patients (10 males and 19 females), aged between 14 and 30 years, were randomly divided into two groups: 14 patients received the SLB and 15 received the CLB. Upper arch impressions were taken for pre-treatment records (T0). A transpalatal arch was soldered to both maxillary first molar bands prior to extraction of the maxillary first premolars, followed by straightwire fixed appliances (0.022 × 0.028 inch). A 0.014 inch nickel titanium (NiTi) wire was used as the levelling and aligning archwire. Four monthly reviews were undertaken and impressions of the upper arch were taken at each appointment (T1, T2, T3, and T4). Displacements of the teeth were determined using Little’s irregularity index (LII). Data were analysed using the Mann–Whitney U-test.

In the aligning stage, the CLB group showed significantly faster alignment of the teeth compared with the SLB group at the T1–T2 interval (P < 0.05). However, there were no differences at T2–T3, and T3–T4 for either group (P > 0.05). The CLB group showed 98 per cent crowding alleviation compared with 67 per cent for the SLB after 4 months of alignment and levelling. Mini Diamond brackets aligned the teeth faster than Damon™ 3 but only during the first month. There was no difference in efficacy between the two groups in the later 3 weeks. Alleviation of crowding was faster with CLB than with SLB.

Journal Article.  3230 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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