Abstract：
This case report outlines the use of a modified Leighton\'s retractor as a method for canine retraction in a patient with severe hypodontia, a history of aggressive periodontitis with tooth loss and idiopathic root resorption affecting multiple teeth. Treatment involved an upper removable appliance in combination with a lower sectional fixed appliance with the aim of improving aesthetics and function for the patient, whilst balancing the need to minimise treatment duration and modify treatment mechanics to reduce the orthodontic risks.
摘要：
该病例报告概述了使用改良的Leighton's牵开器作为严重牙体发育不全患者的犬类牵开方法。有侵袭性牙周炎病史，牙齿脱落和特发性牙根吸收影响多颗牙齿。治疗涉及上部可拆卸矫治器与下部固定矫治器的组合，目的是改善患者的美学和功能。同时平衡最小化治疗持续时间和修改治疗机制以降低正畸风险的需要。
