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作者报道5例(男2,女3)共7个下颌易位牙的矫正方法。患者年龄12～15岁,其中双侧易位3例、单侧易位2例,均为尖牙与侧切牙易位。伴有上颌侧切牙的先天缺失或呈钉形、下颌侧切牙扭转(最大180度)、乳尖牙和/或乳侧切牙滞留。矫正前,先拔除滞留牙,3例用Edgewise矫治器矫正扭转的侧切牙,经调磨尖牙外形后用(?)舌面固定式或可摘式Hewley氏保持器保持;其余2例,因下牙弓拥挤,仅拔除扭转的侧切牙后自行调整。在复习有关文献后作者指出,对易位牙产生的原因有两种观点。一为牙齿发育早期,牙胚位置互换;二为尖牙萌出时偏离正常途径,后者似乎容易接受。由于下颌的颊舌侧均为致密骨质,完全性易位牙的牙根又互相平行,因此,矫正的目的只需将易位牙所
The authors reported 5 cases (male 2, female 3) a total of seven mandibular translocation correction method. Patients aged 12 to 15 years old, including bilateral translocation in 3 cases, 2 cases of unilateral transposition, both canine and lateral incisors translocation. With congenital absence or spiculation of the maxillary lateral incisor, the mandibular lateral incisor is twisted (maximum 180 degrees), the canine and / or the lateral incisors remain. Before orthodontic treatment, delaminated teeth were first removed, and 3 cases of lateral incisors corrected by Edgewise appliance were maintained with (?) Lingual fixed or removable Hewley's retainer after being contoured. The remaining 2 patients Under the crowded arch, only to remove the twisted lateral incisors adjusted. After reviewing the literature, the authors point out that there are two possible reasons for translocation. One for the early tooth development, the location of tooth germ exchange; two for the eruption of the deviating from the normal pathway, the latter seems easy to accept. As the mandibular buccal and lingual side are dense bone, complete transposition of tooth root parallel to each other, therefore, the purpose of correction only translocation of the tooth