Lo F D, Hunter W S
Am J Orthod. 1982 Nov;82(5):384-91. doi: 10.1016/0002-9416(82)90187-7.
Changes in the nasolabial angle of the soft-tissue profile were assessed quantitatively in a serial cephalometric study of fifty treated subjects and forty-three untreated subjects, all of whom had Class II, Division 1 malocclusions. Correlations, simple and multiple regression analyses, and multifactorial analysis of variance were used to examine the changes in the nasolabial angle owing to incisor superius retraction and associated skeletal displacements. There were no significant changes in nasolabial angle because of growth. However, the greater the maxillary incisor retraction, the greater was the increase in nasolabial angle. Increase in the nasolabial angle showed a significant correlation with treatment-related increase in the vertical dimension of the lower face. The soft-tissue profile followed closely the underlying skeletal framework. Extraction and nonextraction treatment procedures did not show significant differences in the changes of the nasolabial angle. Results permit prediction of the changes in nasolabial angle owing to incisor superius retraction in orthodontic treatment.
在一项对50名接受治疗的受试者和43名未接受治疗的受试者进行的系列头影测量研究中，对软组织侧貌的鼻唇角变化进行了定量评估，所有受试者均为安氏II类1分类错牙合。采用相关性分析、简单和多元回归分析以及多因素方差分析，研究由于上颌切牙后移及相关骨骼移位导致的鼻唇角变化。生长因素导致的鼻唇角无显著变化。然而，上颌切牙后移越多，鼻唇角增加越大。鼻唇角增加与治疗相关的下脸垂直维度增加显著相关。软组织侧貌与下方骨骼框架密切相关。拔牙和不拔牙治疗程序在鼻唇角变化方面未显示出显著差异。研究结果有助于预测正畸治疗中由于上颌切牙后移导致的鼻唇角变化。
