Department of Orthodontics, and National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China.
Department of Orthodontics, and National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, and Second Dental Center, Peking University School and Hospital of Stomatology, Beijing, China.
Am J Orthod Dentofacial Orthop. 2021 May;159(5):e423-e437. doi: 10.1016/j.ajodo.2020.07.036. Epub 2021 Feb 27.
The objective of this research was to evaluate the correlation between 3-dimensional (3D) lip vermilion (LV) morphology and skeletal patterns as well as incisor measurements in young Chinese adults.
In all, 240 young adults were enrolled; these included 80 patients each with skeletal Class I, Class II, and Class III malocclusions, respectively. Each sagittal skeletal pattern included 40 male and 40 female subjects. Twenty-two 3D LV measurements were obtained from 3D facial scans. Skeletal and incisor measurements were evaluated on lateral cephalograms. Correlation and regression analysis were performed between soft and hard tissue measurements.
Six of 22 LV measurements showed significant differences between male and female subjects. The 3D LV morphology showed significant differences with respect to different skeletal patterns and sex. Adults with skeletal Class III malocclusion tended to have thinner upper vermilion and fuller lower vermilion than subjects with skeletal Class II and III malocclusion. The mandibular plane angle negatively correlated with the upper-lower vermilion midsagittal curve length and surface area ratio in adults with skeletal Class I and II malocclusion, yet the vertical facial skeletal type showed no correlation in adults with skeletal Class III malocclusion. The vermilion angle, central bow angle, vermilion height, vermilion midsagittal curve length, vermilion height and width ratio, and vermilion surface area showed a significant correlation with incisor measurements. Regression analysis found that the ANB angle was an important factor affecting the upper and lower vermilion midsagittal curve length and surface area ratio. Further, the vermilion height and height and width ratio were closely correlated with the interincisal (U1/L1) angle, whereas the central bow angle was closely correlated with the maxillary incisor torque.
Most LV morphology variables were correlated to skeletal patterns and incisor measurements. Skeletal Class III malocclusion showed significant differences in vermilion morphology. Both the sagittal and vertical skeletal pattern have effects on vermilion proportion. The incisor torque was closely correlated to vermilion shape and central bow angle and might influence the vermilion esthetics. However, the proportion of the upper and lower vermilion was mainly affected by the ANB angle.
本研究旨在评估中国年轻成年人的 3 维（3D）唇红（LV）形态与骨骼形态以及切牙测量值之间的相关性。
共纳入 240 名年轻成年人，分别包括骨骼分类 I、II 和 III 类错畸形的患者各 80 例。每个矢状骨型包括 40 名男性和 40 名女性受试者。从 3D 面部扫描中获得 22 项 3D LV 测量值。在侧位头颅侧位片上评估骨骼和切牙测量值。对软组织和硬组织测量值进行相关性和回归分析。
22 项 LV 测量值中有 6 项在男性和女性受试者之间存在显著差异。3D LV 形态在不同骨骼形态和性别方面存在显著差异。骨骼 III 类错畸形患者的上唇红较薄，下唇红较丰满，而骨骼 II 类和 III 类错畸形患者的上唇红较厚，下唇红较丰满。下颌平面角与骨骼 I 类和 II 类错畸形患者的上下唇中矢状曲线长度和表面积比呈负相关，而骨骼 III 类错畸形患者的垂直面型无相关性。唇红角、中央弓角、唇红高度、唇红中矢状曲线长度、唇红高度和宽度比、唇红表面积与切牙测量值呈显著相关。回归分析发现，ANB 角是影响上下唇中矢状曲线长度和表面积比的重要因素。此外，唇红高度和高度与宽度比与切牙（U1/L1）角密切相关，而中央弓角与上颌切牙转矩密切相关。
大多数 LV 形态变量与骨骼形态和切牙测量值相关。骨骼 III 类错畸形患者的唇红形态存在显著差异。矢状面和垂直面骨骼形态均对唇红比例有影响。切牙转矩与唇红形态和中央弓角密切相关，可能影响唇红美观。然而，上下唇红的比例主要受 ANB 角的影响。
