ĐẶC ĐIỂM LÂM SÀNG, X-QUANG SAI KHỚP CẮN LOẠI I ANGLE ĐIỀU TRỊ VỚI SỰ HỖ TRỢ KÉO LUI CỦA MINIVIS

Abstract

Objective: To describe the clinical features and radiographic characteristics of Angle Class I malocclusion in patients undergoing tooth extraction combined with anterior retraction using miniscrews at Can Tho University of Medicine and Pharmacy Hospital from 2023 to 2025. Methods: A descriptive cross-sectional study on 32 patients aged 18 to 35 years, diagnosed with Angle Class I malocclusion, meeting the inclusion criteria, who came for orthodontic examination and treatment at Can Tho University of Medicine and Pharmacy Hospital from 2023 to 202. Results: 96.88% of patients had a convex facial profile.81.25% exhibited facial symmetry. The mean PAR and weighted PAR (PAR-W) scores were 8.41 and 17.31, respectively. Cephalometric findings: ANB: 5.21 ± 2.46°, (suggesting skeletal Class II tendency), SNA: 85.16 ± 3.51°SN-GoGn: 32.13 ± 5.60° (indicating backward mandibular growth), U1-NA: 28.17 ± 8.08°L1-NB: 33.30 ± 5.41°, 5.38 ± 2.66 mmInterincisal angle: 113.31 ± 6.18°, Nasolabial angle: 83.44 ± 11.78°. Conclusion: The majority of patients presented with symmetrical faces and convex profiles. Cephalometric analysis revealed a skeletal Class II pattern with a high ANB angle and retrusive mandible. Both upper and lower incisors were proclined and protruded. The acute nasolabial angle further indicated upper lip protrusion, supporting the need for retraction using miniscrew anchorage in treatment planning.