A longitudinal 3-dimensional size and shape comparison of untreated Class I and Class II subjects
A longitudinal 3-dimensional size and shape comparison of untreated Class I and Class II subjects
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DOI：
10.1016/j.ajodo.2003.12.029
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发表时间：
2005-05-01
影响因子：
3
通讯作者：
Broadbent, BH
中科院分区：
文献类型：
--
作者：
Palomo, JM;Hunt, DW;Broadbent, BH
背景：1925年Broadbent-Bolton头计的发明使得从双正交平片头部x线片收集三维数据成为可能。本研究的目的是比较16名未经治疗的II类1类博尔顿女孩和16名未经治疗的I类博尔顿女孩颅面结构形状和大小的纵向变化。方法：采用Procrustes分析比较30个三维头颅测量标志的差异。同样的方法也用于分析4个标志亚群（上颌骨、下颌骨、面中部和颅穹窿）的变化。比较包括II类样本中6岁、11岁和15岁相邻年龄组之间的形状和大小差异，以及每个年龄段I类和II类样本之间的形状和大小差异。结果：总的来说，从6岁到15岁，两个样本的颅面复合体经历了连续的形状变化。在II类样本中，6岁至11岁之间的下颌标志对颅面形状变化的贡献最小。与第一类样本相比，第二类样本具有：(1)面部图案更长；(2)6岁时下颌形状差异最小，15岁时最大；(3)与第一类样本相比，所有年龄段的上颌标志都更突出。第二类样本在11岁至15岁之间的大小变化最大（6.5%），而第一类样本在6岁至11岁之间的大小变化最大（10.5%）。结论：本样本中II类和I类受试者在生长发育过程中观察到具有临床意义的大小和形状差异。
Background: The invention of the Broadbent-Bolton cephalometer in 1925 made possible the collection of 3-dimensional data from biorthogonal plain film head radiographs. The objective of this study was to compare longitudinal changes in the shape and size of craniofacial structures between 16 untreated Class II Division 1 girls and 16 untreated Class I Bolton girls. Methods: Procrustes analyses were used to compare differences in 30 cephalometric landmarks that were 3-dimensional. The same methods were also used to analyze changes of 4 subsets of landmarks (maxilla, mandible, midface, and cranial vault). Comparisons included shape and size differences between adjacent age groups at ages 6, 11, and 15 in the Class II sample as well as between the Class I and Class II samples at each age. Results: Overall, the craniofacial complex underwent continuous shape change from ages 6 to 15 in both samples. In the Class II sample, the smallest contribution to craniofacial shape change was seen for the mandibular landmarks between ages 6 and 11. Compared with the Class I sample, the Class II sample had (1) a longer facial pattern, (2) the smallest mandibular shape difference at age 6 and the largest at age 15, and (3) more protrusive maxillary landmarks at all ages compared with the Class I sample. The Class II sample also had the largest change in size from ages 11 to 15 (6.5%), whereas the Class I sample showed the greatest size change (10.5%) from ages 6 to 11. Conclusions: Clinically significant size and shape differences were observed during growth and development between Class II and Class I subjects in this sample.