SO SÁNH TRƯỚC VÀ SAU ĐIỀU TRỊ CHỈNH HÌNH RĂNG MẶT KHÔNG NHỔ RĂNG TRÊN BỆNH NHÂN TRƯỞNG THÀNH SAI KHỚP CẮN HẠNG I ANGLE

Abstract

Objective: Comparison before and after orthodontic treatment with non-extraction on adult patients with Angle class I malocclusion. Subjects and Methods: The sample included 30 pairs of pre and post-treatment cephalometric radiographies and 30 pairs of pre-treatment dental casts of patients treated orthodontic at the high-tech treatment area, Faculty of Dentistry, University of Medicine and Pharmacy Ho Chi Minh City. Patients selected that had the following characteristics: class I skeletal correlation, class I malocclusion (Angle) and crowding of the mandibular teeth arch ≤ 9mm. AutoCAD 2018 software to measure the variables of teeth, bone and profile. Results: mandibular crowds: -1,08 ± 3,85mm, angle SNA at pre-treatment 81,60 ± 3,42°, increased in post-treatment 81,83 ± 3,68°. Occlusal plane at pre-treatment 7,57 ± 3,68°, increased in post-treatment 8,37 ± 3,31°. Projection distance of points A and B onto the occlusal plane pre-treatment -2,86 ± 2,38mm, increased in post-treatment -3,32 ± 2,02mm statistically significant p<0,05. The upper central incisor decreased inclined, the tooth axis rotates clockwise, angle U1/NA at pre-treatment 30,47 ± 7,69° decreased in post-treatment 26,80  ± 6,15° statistically significant p<0,05. The face convex angle, nasolabial angle, and lip-chin angle did not change significantly. Conclusion: Orthodontic treatment of class I malocclusion with non-extraction in adults has changes in teeth, few in bone and soft tissue profile.