Guan X, Chang D T, Yan Y, Zhang Y W, Zhou Y H, Song Y
Department of Orthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China [Present address: Sunny Dental Invisable Orthodontic Center, Beijing 100020, China].
Department of Orthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2017 Sep 9;52(9):549-553. doi: 10.3760/cma.j.issn.1002-0098.2017.09.007.
To evaluate the efficiency of clear aligners in treating bimaxillary protrusion patients with first premolar extractions. Eleven patients with bimaxillary protrusion were selected in this study. All of them were treated by using clear aligners with four first premolar extractions and need maximal anchorage. Cephalometric analysis was carried out before and after treatment. Cephalometric analysis results showed that significant changes in teeth and profile could be detected after clear aligner treatment and no change could be found in skeletal pattern. Upper and lower anterior teeth were retracted. The control of anterior torque and posterior anchorage were effective. The soft tissue analysis showed that position of upper and lower lip was significantly changed which improve the profile of patients. After treatment, the distance of U1 to NA and L1 to NB reduced by (5.19±4.12) mm and (4.53±1.20) mm, respectively. The differences were statistically significant (<0.01). Bimaxillary protrusion patients who needed premolar extractions and maximal anchorage could be treated with clear aligners.
评估隐形矫治器治疗双颌前突患者拔除第一前磨牙的疗效。本研究选取了11例双颌前突患者。所有患者均采用隐形矫治器治疗，拔除四颗第一前磨牙，且需要强支抗。治疗前后进行头影测量分析。头影测量分析结果显示，隐形矫治器治疗后牙齿和侧貌有显著变化，而骨骼形态无变化。上下前牙内收。前牙转矩和后牙支抗的控制有效。软组织分析表明，上下唇位置有显著变化，改善了患者的侧貌。治疗后，U1至NA和L1至NB的距离分别减少了(5.19±4.12)mm和(4.53±1.20)mm。差异有统计学意义(<0.01)。需要拔除前磨牙和强支抗的双颌前突患者可用隐形矫治器治疗。
