Rochester, N.Y.; and Stanford, Calif. From the Division of Plastic and Reconstructive Surgery, Department of General Surgery, University of Rochester Medical Center, and the Division of Plastic and Reconstructive Surgery, Department of General Surgery, Stanford University Medical Center.
Plast Reconstr Surg. 2010 Jan;125(1):332-342. doi: 10.1097/PRS.0b013e3181c2a685.
Facial aging is a dynamic process involving the aging of soft-tissue and bony structures. In this study, the authors demonstrate how specific bony aspects of the mandible change with age in both genders and what impact these structural changes may have on overall facial aesthetics.
Facial bone three-dimensional computed tomographic scans were obtained from 120 Caucasian subjects (60 women and 60 men). Our study population consisted of 20 male and 20 female subjects in each of three age categories (20 to 40, 41 to 64, and > or = 65 years). Edentulous patients were excluded. The following measurements were obtained: bigonial width, ramus breadth, ramus height, mandibular body height, mandibular body length, and mandibular angle. The data were analyzed with one-way analysis of variance and two-tailed t tests, with results considered significant at a value of p < 0.05.
There was no significant change with regard to bigonial width or ramus breadth across age groups for either gender. Ramus height, mandibular body height, and mandibular body length decreased significantly with age for both genders, whereas the mandibular angle increased significantly for both genders with increasing age.
These results suggest that the bony elements of the mandible change significantly with age for both genders and that these changes, coupled with soft-tissue changes, lead to the appearance of the aged lower third of the face.
面部衰老过程是一个涉及软组织和骨骼结构老化的动态过程。本研究旨在展示下颌骨的特定骨性方面在两性中如何随年龄发生变化，以及这些结构变化可能对面部整体美学产生的影响。
从 120 名白种人受试者（60 名女性和 60 名男性）中获得面部骨骼三维计算机断层扫描。我们的研究人群包括每个年龄组（20-40 岁、41-64 岁和≥65 岁）的 20 名男性和 20 名女性受试者。排除无牙患者。获得以下测量值：髁间宽度、下颌支宽度、下颌支高度、下颌体高度、下颌体长度和下颌角。使用单因素方差分析和双侧 t 检验对数据进行分析，结果以 p < 0.05 为差异有统计学意义。
两性在各年龄组中，髁间宽度或下颌支宽度均无显著变化。男女两性的下颌支高度、下颌体高度和下颌体长度随年龄增长显著下降，而下颌角随年龄增长显著增加。
这些结果表明，下颌骨的骨性成分在两性中随年龄显著变化，这些变化与软组织变化一起导致衰老下面部下部的出现。
