Kalra V, Burstone C J, Nanda R
Department of Orthodontics, University of Connecticut School of Dental Medicine, Farmington.
Am J Orthod Dentofacial Orthop. 1989 Jun;95(6):467-78. doi: 10.1016/0889-5406(89)90410-1.
The purpose of the study was to design and evaluate the effects of a fixed magnetic appliance that hinged the mandible open and exerted an intrusive force on the teeth. Ten patients between the ages of 8 years and 10 years 6 months, with Class II, Division 1 malocclusion associated with mandibular retrusion and increased lower facial height, were treated with this appliance. The length of treatment was 4 months, after which the appliance was removed and the patients were followed up for 4 months. Ten children with similar age, sex, and dentofacial characteristics acted as controls and did not receive any appliance therapy. Changes in morphology of the dentofacial complex were evaluated by use of lateral cephalograms and study models. In addition temporomandibular joint and muscle functions were assessed. During treatment mandibular length increased 3.2 mm, angle of facial convexity decreased 2.8 degrees, the upper and lower teeth intruded an average of 1.5 mm each, and the mandibular plane angle decreased 1.3 degrees. In the follow-up period, some rebound eruption was noted; however, all other changes were stable.
本研究的目的是设计并评估一种固定磁性矫治器的效果，该矫治器可使下颌张开并对牙齿施加垂直向压入力。对10例年龄在8岁至10岁6个月之间、患有安氏II类1分类错牙合且伴有下颌后缩和下面高增加的患者使用了该矫治器。治疗时长为4个月，之后拆除矫治器并对患者进行了4个月的随访。10名年龄、性别和牙颌面特征相似的儿童作为对照，未接受任何矫治器治疗。通过头颅侧位片和研究模型评估牙颌面复合体的形态变化。此外，还评估了颞下颌关节和肌肉功能。治疗期间，下颌长度增加了3.2毫米，面部凸度角减小了2.8度，上下牙齿平均各压入1.5毫米，下颌平面角减小了1.3度。在随访期间，观察到有一些牙齿的再萌出反弹；然而，所有其他变化均保持稳定。
