School of Odonto Stomatology, Hanoi Medical University, Hanoi 100000, Vietnam.
Viet Anh Orthodontic Clinic, Hanoi 100000, Vietnam.
Int J Environ Res Public Health. 2021 May 18;18(10):5381. doi: 10.3390/ijerph18105381.
A skeletal Class III malocclusion with open bite tendency is considered very difficult to treat orthodontically without surgery. This case report describes the lingual orthodontic treatment of an adult skeletal Class III patient with mandibular deviation to the left side, lateral open bite, unilateral posterior crossbite, zero overbite and negative overjet. The lower incisors were already retroclined to compensate with the skeletal discrepancy. The patient was treated by asymmetric molar extraction in the mandibular arch to retract the lower incisors and correct the dental midline, with the help of intermaxillary elastics. Lingual appliance was used with over-torqued lower anterior teeth's brackets to control the torque of mandibular incisors. After a 30-month treatment, satisfactory smile and facial esthetics and good occlusion was achieved. A 12-month follow-up confirmed that the outcome was stable. Asymmetric molar extraction could be a viable option to retract mandibular incisors in Class III malocclusion with lower dental midline deviation.
骨性 III 类错颌伴开颌倾向被认为如果不手术很难通过正畸治疗。本病例报告描述了一位成人骨性 III 类患者的舌侧正畸治疗，该患者存在下颌向左侧偏斜、双侧后牙反颌、单侧后牙锁颌、零覆颌和负覆盖。下颌切牙已经发生代偿性后倾以弥补骨骼差异。通过在下颌弓进行不对称磨牙拔除来内收下颌切牙并矫正牙中线，同时使用颌间橡皮圈辅助治疗。使用舌侧矫治器，通过过度转矩下前牙的托槽来控制下颌切牙的转矩。经过 30 个月的治疗，获得了满意的微笑和面部美观以及良好的咬合关系。12 个月的随访证实治疗效果稳定。对于下颌中线偏斜的 III 类错颌，不对称磨牙拔除可以作为内收下颌切牙的一种可行选择。
