Moseling Kylie P, Woods Michael G
School of Dental Science, The University of Melbourne, Australia.
Angle Orthod. 2004 Feb;74(1):51-62. doi: 10.1043/0003-3219(2004)074<0051:LCCIFW>2.0.CO;2.
Changes in lip curvature resulting from treatment have been largely ignored in orthodontic literature. The focus instead has been primarily directed at retraction of the vermilion border and changes in the nasolabial angle. This study, therefore, was designed to retrospectively analyze changes in the upper and lower lip curves associated with growth and treatment. The lateral cephalometric records of 137 female orthodontic patients were digitized. Sixty-two were treated with premolar extractions and 75 without extractions. The overall extraction group was further divided into subgroups on the basis of the chosen extraction sequence, which included extraction of 4/4, 4/5, or 5/5. Statistical analysis revealed no significant differences in changes in lip curve depth between the two overall samples, relative to either of the two reference lines. This would suggest that an appropriately selected plan, whether extraction or nonextraction, should allow treatment to be carried out without negative effects on the curvature of the lips. Calculation of correlation coefficients and regression analysis suggested that the inherent properties and morphology of the soft tissues themselves are probably the greatest determinants of lip curve behavior with treatment. The midface soft tissues appear to be less dependent on changes in the underlying hard tissues than do the lower face soft tissues. Pretreatment upper and lower incisor positions and angulations and the underlying vertical facial dimension appear to play more significant roles in the behavior of the lower lip than the upper lip.
正畸学文献在很大程度上忽略了治疗引起的唇曲率变化。相反，重点主要放在了红唇缘的后缩以及鼻唇角的变化上。因此，本研究旨在回顾性分析与生长和治疗相关的上、下唇曲线变化。对137名女性正畸患者的头颅侧位片记录进行了数字化处理。其中62名接受了前磨牙拔除治疗，75名未接受拔牙治疗。总体拔牙组根据所选的拔牙顺序进一步分为亚组，包括拔除4/4、4/5或5/5。统计分析表明，相对于两条参考线中的任何一条，两个总体样本之间唇曲线深度的变化没有显著差异。这表明，无论选择拔牙还是不拔牙方案，只要选择得当，都应能在不对唇曲率产生负面影响的情况下进行治疗。相关系数的计算和回归分析表明，软组织自身的固有特性和形态可能是治疗中唇曲线变化的最大决定因素。面中部软组织似乎比面下部软组织对其下方硬组织变化的依赖性更小。治疗前的上、下切牙位置和角度以及面部垂直维度似乎在下唇变化中比在上唇变化中发挥更重要的作用。
