Three-dimensional analysis of tooth movement in Class II malocclusion treatment using arch wire with continuous tip-back bends and intermaxillary elastics
이지예, 최성권, 권태훈, 강경화, 김상철,
소속 상세정보
이지예 ( Lee Ji-Yea ) - Wonkwang University School of Dentistry Department of Orthodontics
최성권 ( Choi Sung-Kwon ) - Wonkwang University School of Dentistry Department of Orthodontics
권태훈 ( Kwon Tae-Hoon ) - Wonkwang University School of Dentistry Department of Orthodontics
강경화 ( Kang Kyung-Hwa ) - Wonkwang University School of Dentistry Department of Orthodontics
김상철 ( Kim Sang-Cheol ) - Wonkwang University School of Dentistry Department of Orthodontics
Abstract
Objective: The aim of this study was to analyze three-dimensional (3D) changes in maxillary dentition in Class II malocclusion treatment using arch wire with continuous tip-back bends or compensating curve, together with intermaxillary elastics by superimposing 3D virtual models.
Methods: The subjects were 20 patients (2 men and 18 women; mean age 20 years 7 months ± 3 years 9 months) with Class II malocclusion treated using 0.016 × 0.022-inch multiloop edgewise arch wire with continuous tip-back bends or titanium molybdenum alloy ideal arch wire with compensating curve, together with intermaxillary elastics. Linear and angular measurements were performed to investigate maxillary teeth displacement by superimposing pre- and post-treatment 3D virtual models using Rapidform 2006 and analyzing the results using paired t-tests.
Results: There were posterior displacement of maxillary teeth (p < 0.01) with distal crown tipping of canine, second premolar and first molar (p < 0.05), expansion of maxillary arch (p < 0.05) with buccoversion of second premolar and first molar (p < 0.01), and distal-in rotation of first molar (p < 0.01). Reduced angular difference between anterior and posterior occlusal planes (p < 0.001), with extrusion of anterior teeth (p < 0.05) and intrusion of second premolar and first molar (p < 0.001) was observed.
Conclusions: Class II treatment using an arch wire with continuous tip-back bends or a compensating curve, together with intermaxillary elastics, could retract and expand maxillary dentition, and reduce occlusal curvature. These results will help clinicians in understanding the mechanism of this Class II treatment.
키워드
Tooth movement; Digital models; Tip-back bend; Intermaxillary elastic
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