Nam Ji-Hye, Choi Youngjun, Lee Kee-Joon, Lee Ji-Hyun, Kim Kyung-Ho, Chung Chooryung J
Department of Orthodontics, The Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, South Korea.
Department of Oral and Maxillofacial Surgery, Dental Center, Chung-Ang University Hospital, Seoul, South Korea.
Am J Orthod Dentofacial Orthop. 2023 Oct;164(4):516-529. doi: 10.1016/j.ajodo.2023.02.019. Epub 2023 Apr 18.
The objective of this study was to evaluate and compare the 3-dimensional (3D) aging changes of the lips among adult skeletal Class I, II, and III malocclusion.
Female adult orthodontic patients aged 20-50 years with pretreatment cone-beam computed tomography scans were retrospectively classified according to age (20s [20-29 years], 30s [30-39 years], and 40s [40-49 years]) and then subclassified by malocclusion into skeletal Class I, II, and III relationship (9 groups; n = 30 per group). Positional differences in midsagittal and parasagittal soft-tissue landmarks and 3D morphologic aging changes of the lips were evaluated using cone-beam computed tomography scans.
Labiale superius and cheilion for patients in their 40s indicated a significant downward and backward position compared with those in their 20s, regardless of skeletal classifications (P <0.05). Accordingly, the upper lip height decreased, and the mouth width increased significantly (P <0.05). For Class III malocclusion, the upper lip vermilion angle was greater for patients in their 40s than those in their 20s (P <0.05), whereas the lower lip vermilion angle was only lower for patients with Class II malocclusion (P <0.05).
Middle-aged adult females (40-49 years) had a lower upper lip height and greater mouth width than those in their 20s, regardless of skeletal malocclusion. However, prominent morphologic aging changes of the lips were noted on the upper lip for skeletal Class III malocclusion and the lower lip for skeletal Class II malocclusion, implying that the underlying skeletal features (or malocclusion) may influence 3D aging changes of the lips.
本研究的目的是评估和比较成人骨骼I类、II类和III类错牙合患者嘴唇的三维（3D）衰老变化。
对年龄在20 - 50岁且有治疗前锥形束计算机断层扫描的成年女性正畸患者，先按年龄（20多岁[20 - 29岁]、30多岁[30 - 39岁]和40多岁[40 - 49岁]）进行回顾性分类，然后再按错牙合情况细分为骨骼I类、II类和III类关系（共9组；每组n = 30）。使用锥形束计算机断层扫描评估矢状面和矢状旁软组织标志点的位置差异以及嘴唇的3D形态衰老变化。
无论骨骼分类如何，40多岁患者的上唇唇峰点和口角点相较于20多岁患者均有显著的向下和向后移位（P < 0.05）。相应地，上唇高度降低，口裂宽度显著增加（P < 0.05）。对于III类错牙合，40多岁患者的上唇红唇角大于20多岁患者（P < 0.05），而对于II类错牙合患者，下唇红唇角仅在40多岁时低于20多岁患者（P < 0.05）。
无论骨骼错牙合情况如何，中年成年女性（40 - 49岁）的上唇高度低于20多岁女性，口裂宽度更大。然而，骨骼III类错牙合在上唇、骨骼II类错牙合在下唇出现了明显的形态衰老变化，这意味着潜在的骨骼特征（或错牙合情况）可能会影响嘴唇的3D衰老变化。
