Vásquez Manuel J, Baccetti Tiziano, Franchi Lorenzo, McNamara James A
Department of Orthodontics, University of Florence, Florence, Italy.
Am J Orthod Dentofacial Orthop. 2009 May;135(5):568.e1-7; discussion 568-9. doi: 10.1016/j.ajodo.2007.05.026.
The purpose of this study was to describe the craniofacial growth changes of subjects with Class II malocclusion associated with maxillary skeletal protrusion at the circumpubertal growth period.
The records of 25 untreated subjects with normal Class I occlusion and 25 untreated Class II subjects (14 boys and 11 girls in each group) were selected from the longitudinal records of the University of Michigan Growth Study. All Class II subjects had maxillary protrusion. Measurements were made on lateral and posteroanterior cephalograms and on dental casts at 2 times. The first observation (T1) was during the prepubertal growth phase (vertebral stages CS1 to CS3). The second observation (T2) was during the postpubertal phase of growth (vertebral stages CS4 to CS6). The following comparisons were made: Class I vs Class II at T1, Class I vs Class II at T2, and growth changes in Class I vs Class II.
No dentofacial feature studied showed any statistically significant difference when comparing the growth changes between the Class II and the Class I groups.
These results suggest that dentofacial features of Class II malocclusion associated with maxillary skeletal protrusion are maintained during the circumpubertal period, and that growth changes in this type of Class II disharmony are similar to those in subjects with normal occlusion.
本研究的目的是描述青春期前后生长发育期伴有上颌骨骨性前突的安氏II类错牙合患者的颅面部生长变化。
从密歇根大学生长发育研究的纵向记录中选取25例未经治疗的安氏I类正常牙合患者和25例未经治疗的安氏II类患者（每组14名男孩和11名女孩）。所有安氏II类患者均有上颌前突。在两个时间点对头颅侧位片、后前位片及石膏模型进行测量。第一次观察（T1）在青春前期生长阶段（脊椎发育阶段CS1至CS3）。第二次观察（T2）在青春后期生长阶段（脊椎发育阶段CS4至CS6）。进行了以下比较：T1时的安氏I类与安氏II类，T2时的安氏I类与安氏II类，以及安氏I类与安氏II类的生长变化。
在比较安氏II类与安氏I类组的生长变化时，所研究的牙颌面特征均未显示出任何统计学上的显著差异。
这些结果表明，伴有上颌骨骨性前突的安氏II类错牙合的牙颌面特征在青春期前后生长发育期保持稳定，并且这种类型的安氏II类错牙合畸形的生长变化与正常牙合患者相似。
