Rothstein T, Phan X L
St. Luke's-Roosevelt Hospital, New York, NY, USA.
Am J Orthod Dentofacial Orthop. 2001 Nov;120(5):542-55. doi: 10.1067/mod.2001.118628.
Growth changes in the dentition and the facial skeleton of boys and girls with Class I malocclusion from 10 to 14 years of age are presented, and the changes are compared with those for children with Class II Division 1 malocclusion. Radiographs of 335 children with Class II Division 1 malocclusion and 273 Class I controls were assessed. Radiographs were converted to x and y coordinate data, and 52 commonly used linear, angular, and coordinate axis measurements were made. Both the Class II Division 1 and the control groups were subdivided into 6 samples according to sex and skeletal age (10, 12, and 14 years +/- 6 months; chronological age ranged from 8.5 to 15.5 years). The mean plots from the coordinate data for the Class I boys and girls at 14 years were superimposed over the mean plots for the 10-year-old groups, creating circumpubertal growth standards. The standards are supported by growth vector diagrams and other data and lead to the following conclusions: (1) boys and girls with Class I malocclusion differ distinctly from each other in the amount and the direction of circumpubertal growth; (2) radiographic composite standards are useful and accurate clinical tools to show mean dentofacial skeletal growth and change between 10 and 14 years of age; (3) compared with the controls, the maxillary dentition of girls with Class II Division 1 malocclusion grows more horizontally, the maxillary (but not the mandibular) incisors procline farther, and the mandible grows more horizontally; (4) compared with the controls, the midfacial convexity in Class II Division 1 boys is markedly increased, due to more horizontal growth at A-point and less horizontal growth at nasion and pogonion, and maxillary and mandibular anterior teeth are proclined farther; (5) angular measurements involving S, N, A-point, B-point, and Pog are useful only when the position of N is known; and (6) cranial base flexure bears no relationship to the development of Class II Division 1 malocclusion.
本文呈现了10至14岁I类错牙合男孩和女孩牙列及面部骨骼的生长变化，并将这些变化与II类1分类错牙合儿童的变化进行了比较。对335例II类1分类错牙合儿童和273例I类对照儿童的X线片进行了评估。X线片被转换为x和y坐标数据，并进行了52项常用的线性、角度和坐标轴测量。II类1分类组和对照组均根据性别和骨骼年龄（10、12和14岁±6个月；实际年龄范围为8.5至15.5岁）细分为6个样本。将14岁I类男孩和女孩坐标数据的平均图叠加在10岁组的平均图上，创建青春期生长标准。这些标准得到生长向量图和其他数据的支持，并得出以下结论：（1）I类错牙合男孩和女孩在青春期生长的量和方向上存在明显差异；（2）X线片综合标准是显示10至14岁平均牙颌面骨骼生长和变化的有用且准确的临床工具；（3）与对照组相比，II类1分类错牙合女孩的上颌牙列生长更水平，上颌（而非下颌）切牙前倾更远，下颌生长更水平；（4）与对照组相比，II类1分类男孩的面中部凸度明显增加，这是由于A点水平生长更多，鼻根点和颏前点水平生长更少，上颌和下颌前牙前倾更远；（5）涉及蝶鞍点（S）、鼻根点（N）、A点、B点和颏前点（Pog）的角度测量仅在知道N点位置时才有用；（6）颅底弯曲与II类1分类错牙合的发生无关。
