Angelieri Fernanda, Almeida Renato Rodrigues de, Almeida Marcio Rodrigues de, Fuziy Acácio
Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.
Am J Orthod Dentofacial Orthop. 2006 Apr;129(4):520-7. doi: 10.1016/j.ajodo.2005.12.003.
This prospective clinical study analyzed the distalization of maxillary molars achieved by the pendulum appliance and its effect on the anchorage teeth during and after fixed orthodontic treatment.
Lateral cephalograms of 22 adolescents (15 girls, 7 boys) taken pretreatment, after distalization, after leveling and aligning, and after fixed orthodontic treatment were evaluated. The initial mean age was 14.5 years (SD = 1.80). The mean time for distalization of the maxillary molars was 5.85 months (SD = 1.82), and the total treatment time was 3.61 years (SD = 1.83).
The pendulum appliance moved the maxillary molars distally, but with significant distal inclination, protrusion of the anterior teeth, and increase in lower anterior facial height (LAFH) due to the clockwise mandibular rotation. After fixed orthodontic treatment, the maxillary incisors and the maxillary first premolars and first molars were returned to their pretreatment anteroposterior positions. Thus, at postdistalization, there was 2.1 mm of protrusion of the maxillary first molars, despite the anchorage reinforcement (Nance button and cervical headgear worn at night during fixed appliance therapy). However, at the end of treatment, all patients had Class I molar relationships.
The pendulum appliance followed by fixed orthodontic treatment corrected the Class II sagittal relationship, especially due to the dentoalveolar changes secondary to the spontaneous mandibular growth in the anterior direction during fixed appliance treatment.
本前瞻性临床研究分析了摆式矫治器实现上颌磨牙远移的情况及其在固定正畸治疗期间和之后对支抗牙的影响。
对22名青少年（15名女孩，7名男孩）治疗前、远移后、排齐整平后以及固定正畸治疗后的头颅侧位片进行评估。初始平均年龄为14.5岁（标准差 = 1.80）。上颌磨牙远移的平均时间为5.85个月（标准差 = 1.82），总治疗时间为3.61年（标准差 = 1.83）。
摆式矫治器使上颌磨牙远移，但伴有明显的远中倾斜、前牙前突以及由于下颌顺时针旋转导致的下前牙面部高度增加。固定正畸治疗后，上颌切牙、上颌第一前磨牙和第一磨牙恢复到治疗前的前后位置。因此，在远移后，尽管采用了支抗增强措施（固定矫治器治疗期间夜间佩戴Nance弓和颈带），上颌第一磨牙仍有2.1 mm的前突。然而，在治疗结束时，所有患者均达到磨牙Ⅰ类关系。
摆式矫治器联合固定正畸治疗纠正了Ⅱ类矢状关系，特别是由于固定矫治器治疗期间下颌向前自发生长继发的牙牙槽骨改变。
