ĐÁNH GIÁ KẾT QUẢ ĐIỀU TRỊ SAI KHỚP CẮN LOẠI I THEO ANGLE CÓ KÉO LUI KHỐI RĂNG TRƯỚC HÀM TRÊN BẰNG DÂY PHÂN ĐOẠN VÀ VÍT HỖ TRỢ

Abstract

Background: En-mass retraction of maxillary anterior teeth with C-wire and miniscrew implant has multiple advantages, such as low friction, reducing periodontal complications at posterior teeth, no impact on the normal posterior occlusion, reducing time of post-extraction space closure and maximum anchorage. Objectives: To evaluate the treatment efficiency in terms of en-mass retraction of maxillary anterior teerth with C-wire and miniscrew implant anchorage in treatment of class I malocclusion. Materials and methods: This study includes 32 patients with class I malocclusion undergoing orthodontic treatments between 2021 and 2023 at Can Tho University of Medicine and Pharmacy. The treatment procedure included extractions of the bimaxillary premolars and en-mass retraction of anterior tooth by using C-wire Niti archwires (0.016”x0.022”) engages on six anterior teeth, Stainless Steel archwires (0.017”x0.025”) engages on the anterior teeth and guiding wire was inserted into the hole of the miniscrew implant to be placed between the second premolar and first molar. Results: The average post extraction space closure time was 12.44±2.38 months, the maxillary incisor axis was reduced 8.69±4.52⁰; the upper incisors were retracted 4.14±1.58 mm, SNA is reduced 0.18±0.46⁰; the soft tissue’s aesthetics are improved. Conclusions: En-mass retraction of maxillary anterior teeth with C-wire and miniscrew implant is performed with simple biomechanics and increase the efficiency of tooth retraction in the treatment of protrusion.