Wilhelm B M, Beck F M, Lidral A C, Vig K W
Department of Orthodontics, Ohio State University, Columbus, OH 43218-2357, USA.
Am J Orthod Dentofacial Orthop. 2001 Apr;119(4):401-5. doi: 10.1067/mod.2001.112872.
The purpose of this retrospective longitudinal study was to compare 7 cephalometric measurements of the cranial base in subjects with Class I and Class II skeletal patterns at ages 1 month, 2 years, and 14 years. A sample of 22 Class I and 21 Class II subjects was selected; the inclusion criteria were overjet, ANB, and Harvold unit difference. Analyses of head circumference, crown-rump length, and weight revealed no significant (P >.15) differences between the Class I and Class II infant subjects at the initial age (1 month). One angular and 6 linear measurements were first compared with a multivariate analysis of variance, which revealed significant effects for age (P <.0001) and the age by skeletal pattern interaction (P =.0266) but not for skeletal pattern (P =.3705). Analyses of variance showed significant (P <.0001) age effects for each of the cephalometric variables but no significant skeletal pattern effects (P >.10). The anterior cranial base measurement of nasion to sphenoethmoidal suture was the only variable found to have a significant age by skeletal pattern interaction (P <.006), which revealed a difference in the timing of its growth spurt that occurred between 1 month and 2 years in the Class I subjects and between 2 years and 14 years in the Class II subjects. There were no significant differences between the skeletal classes at any of the 3 ages evaluated. Conclusions from this study indicate that cranial base growth patterns are similar for Class I and Class II subjects and that the premise of a more obtuse "saddle angle" or cranial base angle in Class II skeletal patterns was not supported.
这项回顾性纵向研究的目的是比较1个月、2岁和14岁时I类和II类骨骼模式受试者的7项颅底头影测量值。选取了22名I类和21名II类受试者作为样本；纳入标准为覆盖、ANB和Harvold单位差异。对头围、顶臀长和体重的分析显示，I类和II类婴儿受试者在初始年龄（1个月）时无显著（P>.15）差异。首先通过多变量方差分析比较了1个角度测量值和6个线性测量值，结果显示年龄有显著影响（P<.0001），年龄与骨骼模式的交互作用也有显著影响（P=.0266），但骨骼模式无显著影响（P=.3705）。方差分析显示，每个头影测量变量的年龄效应均显著（P<.0001），但骨骼模式效应不显著（P>.10）。从鼻根点到蝶筛缝的前颅底测量值是唯一发现年龄与骨骼模式有显著交互作用的变量（P<.006），这表明I类受试者在1个月至2岁之间、II类受试者在2岁至14岁之间其生长突增的时间存在差异。在评估的3个年龄中的任何一个年龄，骨骼类别之间均无显著差异。本研究的结论表明，I类和II类受试者的颅底生长模式相似，II类骨骼模式中“鞍角”或颅底角更钝的假设不成立。
