Buschang P H, Tanguay R, Demirjian A, LaPalme L, Goldstein H
Faculté Médicine Dentaire, Université de Montréal, Québec, Canada.
Am J Orthod Dentofacial Orthop. 1989 Jan;95(1):60-6. doi: 10.1016/0889-5406(89)90136-4.
Growth of the cephalometric landmark gnathion is modeled mathematically with multilevel statistical techniques. The findings, pertaining to a mixed longitudinal sample (N = 772) of 105 girls, 6 to 15 years of age, provide the most accurate descriptions of longitudinal mandibular growth presently available. Polar, rather than rectangular, coordinates are used to better distinguish between the amount and direction of growth. The velocity curve for sella-gnathion includes growth spurts during childhood (7.5 years) and adolescence (12.7 years). Growth direction of gnathion changes regularly throughout the age range, indicating a relative increase of vertical over horizontal growth. These reference standards serve as a basis for comparing and better understanding abnormal growth patterns.
采用多级统计技术对头颅测量标志点颏下点的生长进行数学建模。研究结果来自于105名6至15岁女孩的混合纵向样本（N = 772），提供了目前关于纵向下颌生长最准确的描述。使用极坐标而非直角坐标，以便更好地区分生长量和生长方向。蝶鞍 - 颏下点的速度曲线包括儿童期（7.5岁）和青春期（12.7岁）的生长突增。在整个年龄范围内，颏下点的生长方向有规律地变化，表明垂直生长相对于水平生长有相对增加。这些参考标准为比较和更好地理解异常生长模式提供了基础。
