一种新型Ⅲ类磁力矫治器在骨性Ⅲ类患者早期治疗中的作用评价

A novel magnetic orthopedic appliance in treatment of preadolescent mild skeletal Class Ⅲ patients

目的:本研究自主开发了一种新型Ⅲ类磁力Twin-block功能矫形装置(MOA-Ⅲ),通过对青春前期安氏Ⅲ类错的临床治疗,分析其对青春前期安氏Ⅲ类错患者颅面复合体的作用,探讨其临床矫治机制。方法:应用MOA-Ⅲ矫治器对30例(男12例,女18例)青春前期轻度骨性Ⅲ类错患者进行治疗。另外选取18例(男7例,女11例)未立刻进行治疗并随访半年的患者作为对照组。患者平均初始年龄为9岁3个月,平均治疗时间为6.6个月。利用SPSS15.0软件包,应用t检验对40项相关头颅测量数据进行分析。结果:MOA-Ⅲ可对上、下颌骨间关系的调整起到非常有效的作用。上颌骨发生前移并伴随一定的顺时针旋转,下颌骨则发生轻度的后下旋转。下颌骨体及下颌支长度无显著变化。治疗后上颌前牙发生一定程度唇倾,而下前牙发生一定程度的舌倾。软组织测量显示,上唇前移而下唇发生一定程度的后移。对照组除一些下颌骨及软组织的测量项目发生变化外,其他项目均无显著差异。结论:通过与未进行治疗的对照组进行比较,应用MOA-Ⅲ矫治器对青春前期轻度骨性Ⅲ类错进行治疗是有效的。其矫治结果主要来自上颌骨及上颌牙列的前移及下颌骨的顺时针方向旋转。

PURPOSE： This study was to develop an intraoral Class Ⅲ orthopedic appliance using attractive magnetic forces, and investigate the effect of magnetic orthopedic appliance（MOA-Ⅲ） on skeletal and dental structures in mild skeletal Class Ⅲ children. METHODS： Thirty patients（12 boys and 18 girls） with mild skeletal Class Ⅲ jaw discrepancies were treated with MOA-Ⅲ. The average age was 9 years 3 months at the beginning of the treatment. The mean treatment period was 6.6 months. A paired t test was carried out to evaluate 40 parameters measured on cephalometric radiographs. Another 18 untreated patients（7 boys and 11 girls） according to upper criteria served as control group. SPSS15.0 software package was used for data analysis. RESULTS： The MOA-Ⅲ produced significant positive changes in maxillomandibular relationship. The maxilla was displaced anteriorly with clockwise rotation. The mandible showed slight downward and backward rotation. No significant changes were displayed in the length of the mandibular body and mandibular ramous. Significant labial tipping of the upper incisors and lingual tipping of lower incisors were noted after treatment. The measurement of soft tissues indicated that the upper lip moved forward and the lower lip retruded backward. In control group, most of the cephalometric measurements were not significantly changed except for some mandibular skeletal measurements and soft tissue measurements. CONCLUSIONS： By comparing to the untreated control, this type of magnetic orthopedic appliance is effective in the early treatment of mild skeletal Class Ⅲmalocclusion children.