Foley T F, Duncan P G
University of Western Ontario, London, Canada.
Angle Orthod. 1997;67(5):373-80. doi: 10.1043/0003-3219(1997)067<0373:STPCIL>2.3.CO;2.
The purpose of this study was to document soft tissue profile changes in late adolescent skeletal Class I males from 14 to 20 years of age and to compare these changes with those of the underlying hard tissues. Using serial lateral cephalograms from a sample of 33 untreated Class I adolescent males, 26 soft and hard tissue parameters were assessed at ages 14 to 16, 16 to 18, and 18 to 20 years. The concept that differential facial growth occurs from nasion to pogonion was substantiated by these data. The hard tissue chin moved forward more than A-point, which in turn moved forward more than nasion, resulting in the hard and soft tissue profile being flattened or reduced in convexity. Horizontal soft tissue thickening of 1.0 mm overlying the hard tissue surfaces from midface to chin was observed at 14-16 years. Continued change of the soft tissue profile from 16 to 20 was thus the result of underlying skeletal growth. Nasal tip increased significantly over all age periods, and underwent the largest growth change of all measurements assessed (approximately 8.0 mm). This growth increase declined by approximately one-half over each successive age period. Although variable, continued soft tissue movements throughout the 14- to 20-year age period affect treatment planning, maintenance of the posttreatment profile, and posttreatment occlusal retention requirements.
本研究的目的是记录14至20岁青春期晚期骨骼I类男性的软组织侧貌变化，并将这些变化与相应的硬组织变化进行比较。利用33例未经治疗的I类青春期男性样本的系列头颅侧位片，在14至16岁、16至18岁和18至20岁时评估了26项软硬组织参数。这些数据证实了从鼻根到颏前点存在不同面部生长的概念。硬组织颏部比A点向前移动更多，而A点又比鼻根向前移动更多，导致硬组织和软组织侧貌变平或凸度减小。在14至16岁时，观察到从中面部到颏部的硬组织表面上方水平软组织增厚1.0 mm。因此，16至20岁时软组织侧貌的持续变化是骨骼生长的结果。鼻尖在所有年龄段均显著增加，并且在所有评估测量中生长变化最大（约8.0 mm）。这种生长增加在每个连续年龄段下降约一半。尽管存在个体差异，但在14至20岁年龄段期间软组织的持续移动会影响治疗计划、治疗后侧貌的维持以及治疗后咬合保持的要求。
