Open AccessControlled Molar Inclination during Maxillary Dental Expansion Using a Straight Rectangular Archwire
Author(s) -
Chanchai Pattanaviriyapisan,
Chairat Charoemratrote,
Udom Thongudomporn
Publication year - 2018
Publication title -
apos trends in orthodontics
Language(s) - English
Resource type - Journals
eISSN - 2321-4600
pISSN - 2321-1407
DOI - 10.4103/apos.apos_70_18
Subject(s) - molar , arch , dental arch , dentistry , orthodontics , crown (dentistry) , materials science , maxillary first molar , mathematics , medicine , structural engineering , engineering
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). 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.