Valentim Z L, Capelli Júnior J, Almeida M A, Bailey L J
State University of Rio de Janeiro, Brazil.
Int J Adult Orthodon Orthognath Surg. 1994;9(1):31-6.
The aims of this study were to evaluate the changes in the facial profile related to maxillary incisor retraction and to check for correlations between changes in the lip and changes in the positions of the teeth and alveolar bone during orthodontic treatment. Initial and final lateral cephalometric radiographs of 25 nongrowing Brazilian patients were selected for this study. All patients initially presented with Class I or II malocclusions and had their maxillary incisors retracted at least 2 mm during orthodontic treatment. Changes in lip position, length, and width, as well as changes in the positions of the alveolar bones and incisors, were calculated. Statistically significant differences from pretreatment to posttreatment were observed for all measurements except for upper lip length and point A. A high correlation was demonstrated between changes in the lower lip sulcus and point B and between changes in the lower lip sulcus and the mandibular incisor. Changes in the maxillary and mandibular incisors did not show a high correlation to the total lip changes, but high correlation coefficients were obtained when the changes in lip width were excluded from the total lip changes. In other words, changes in lip width tended to mask the changes in lip position caused by retraction of the maxillary incisors.
本研究的目的是评估与上颌切牙后移相关的面部轮廓变化，并检查正畸治疗期间唇部变化与牙齿及牙槽骨位置变化之间的相关性。本研究选取了25名生长发育已完成的巴西患者的初始和最终头颅侧位片。所有患者最初均表现为安氏Ⅰ类或Ⅱ类错牙合，且在正畸治疗期间上颌切牙后移至少2 mm。计算唇部位置、长度和宽度的变化，以及牙槽骨和切牙位置的变化。除上唇长度和A点外，所有测量值从治疗前到治疗后均观察到统计学上的显著差异。下唇沟与B点的变化之间以及下唇沟与下颌切牙的变化之间显示出高度相关性。上颌和下颌切牙的变化与唇部总体变化没有高度相关性，但当从唇部总体变化中排除唇宽变化时，获得了较高的相关系数。换句话说，唇宽变化倾向于掩盖上颌切牙后移引起的唇部位置变化。
