Orthodontic Clinic, Department of Orthodontics, Seoul National University Dental Hospital, Seoul, Korea.
Am J Orthod Dentofacial Orthop. 2010 Nov;138(5):656-65. doi: 10.1016/j.ajodo.2009.01.026.
The patient was an adolescent boy, aged 15.6 years, with a mutilated dentition. He had extrusion of the maxillary left first molar because of loss of the mandibular first molar and lingual tilting and rotation of the mandibular second molars. Both left and right second molars were in scissors-bite that was more severe on the left side. By using mini-implants and a TPA with hooks, a 3-mm intrusion was successfully made on the maxillary left first molar. This provided room for mesial movement of the mandibular left second molar. The second molar was protracted into the space of the missing first molar, and the mandibular left third molar was positioned in place of the second molar. The second molars scissors-bite was corrected. Active treatment took 45 months, and the treatment result remained stable 2 years after debonding.
患者为 15.6 岁的青少年男性，牙列残缺。因下颌第一磨牙缺失，导致上颌左第一磨牙近中颊舌向倾斜、扭转、伸长，下颌第二磨牙颊舌向倾斜、扭转，双侧第二磨牙呈交叉𬌗，左侧更为严重。使用微型种植体和带钩的 TPA，成功地使上颌左第一磨牙向口腔内压低 3mm，为下颌左第二磨牙近中移动提供了间隙。第二磨牙被牵入缺失的第一磨牙间隙内，下颌左第三磨牙替代第二磨牙的位置。纠正了第二磨牙的交叉𬌗关系。治疗时间为 45 个月，拆除矫治器后 2 年治疗结果稳定。
