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ORIGINAL ARTICLE
Year : 2018  |  Volume : 8  |  Issue : 4  |  Page : 204-208

Controlled molar inclination during maxillary dental expansion using a straight rectangular archwire


Department of Preventive Dentistry, Faculty of Dentistry, Orthodontic Section, Prince of Songkla University, Hat Yai, Songkhla, Thailand

Correspondence Address:
Assoc. Prof. Udom Thongudomporn
Department of Preventive Dentistry, Faculty of Dentistry, Orthodontic Section, Prince of Songkla University, Hat Yai, Songkhla 90112
Thailand
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/apos.apos_70_18

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Purpose: The purpose of this study was to examine whether the amount of transversal dental expansion, controlled using a straight rectangular beta-titanium alloy (TMA®) wire, has an influence on changes in maxillary first molar inclination. Materials and Methods: Twenty patients requiring bilateral maxillary dental arch expansion were treated using a 0.018”-slot preadjusted edge-wise fixed appliance. Once leveled and aligned, the maxillary dental arches were expanded using a 0.016” × 0.022” straight TMA® wire. Changes in arch width and maxillary first molar inclination were assessed before (T0) and after (T1) expansion using three-dimensional scanned models. Mann–Whitney U-test, Wilcoxon signed-rank test, and Kruskal–Wallis test were used, where appropriate, to compare changes between and within groups. Results: Intermolar width expanded at a rate of 0.8 ± 0.3 mm/month, and first molar buccal crown tipping occurred at 2.1° ± 1.2° (P < 0.05). Changes in inclination between minor expansion (1.0–2.5 mm) and moderate expansion (2.6–4.0 mm) groups were not statistically significant (1.8 ± 0.5 vs. 2.2 ± 1.2; P > 0.05). Conclusions: Use of a straight rectangular TMA® wire in conjunction with a fixed orthodontic appliance successfully expanded the maxillary dental arch. The amount of expansion had no effect on molar inclination.


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