Chen Fengshan, Wu Liping, Terada Kazuto, Saito Isao
Department of Orthodontics, Dental School,Tongji University, Shanghai, China.
Angle Orthod. 2007 May;77(3):397-403. doi: 10.2319/0003-3219(2007)077[0397:LIRICI]2.0.CO;2.
To analyze the sagittal, vertical, and transverse relationships of the maxilla and mandible in Japanese girls with Class III malocclusions with different inclination of mandibular plane.
This longitudinal study utilized serial posteroanterior and lateral cephalograms of 56 untreated subjects from the age of 8 years until the age of 14 years (low mandibular plane angle group: n = 20; average mandibular plane angle group: n = 15; high mandibular plane angle group: n = 21). Sagittal and vertical growth was analyzed on the basis of lateral cephalograms, and transverse growth was analyzed on the basis of posteroanterior cephalograms.
There was no significant difference in intermaxillary sagittal relationships among the three groups from age 8 until 14. On the other hand, there were significant changes in the vertical and transverse intermaxillary relationships during this period. When comparing the three groups at the same age, there were significant differences in vertical and transverse intermaxillary relationships in some ages, whereas no significant difference was found in sagittal relationships in any ages.
The inclination of mandibular plane might play a role in anticipating changes in vertical and transverse intermaxillary relationships from 8 until 14 years of age.
分析下颌平面倾斜度不同的日本III类错牙合女童上颌骨与下颌骨的矢状、垂直和横向关系。
这项纵向研究使用了56名未经治疗的受试者从8岁至14岁的系列后前位和侧位头影测量片（低下颌平面角组：n = 20；平均下颌平面角组：n = 15；高下颌平面角组：n = 21）。基于侧位头影测量片分析矢状和垂直生长，基于后前位头影测量片分析横向生长。
从8岁到14岁，三组之间的上颌间矢状关系没有显著差异。另一方面，在此期间垂直和横向的上颌间关系有显著变化。在同一年龄比较三组时，某些年龄的垂直和横向上颌间关系存在显著差异，而在任何年龄的矢状关系中均未发现显著差异。
下颌平面的倾斜度可能在预测8至14岁期间垂直和横向的上颌间关系变化中起作用。
