Exploration of three-dimensional aesthetic measurement: its value in the diagnosis and treatment of mandibular angle hypertrophy in Shanghai young female
10.3760/cma.j.cn114453-20220517-00150
- VernacularTitle:上海地区青年女性下颌三维测量及其在下颌角肥大诊疗中的价值
- Author:
Antong DU
1
;
Neng DING
;
Yingnan GENG
;
Jie ZHU
;
Jian ZHANG
;
Lie ZHU
Author Information
1. 海军军医大学第二附属医院（上海长征医院）烧伤、整形外科，上海 200003
- Keywords:
Cephalometry;
Prominent mandibular angle;
Mandibular osteotomy;
Three-dimensional measurement
- From:
Chinese Journal of Plastic Surgery
2023;39(7):721-729
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore the application of three-dimensional measurement data in the diagnosis and treatment of mandibular angle prominent in Shanghai female youth.Methods:The young females in Shanghai were selected from the Clinical Database of Shanghai Universal Medical Imaging Diagnostic Center in Xuhui and the Second Affiliated Hospital of Naval Medical University from January 2010 to December 2020. Three-dimensional reconstruction of the craniofacial region was performed using computer-aided technology, and the subjects were divided into prominent group, attractive group, and contrast group according to the three-dimensional reconstruction images and doctor’s evaluation results. The mandibular and facial regions of the three groups were measured in three dimensions. The measurement indicators included bone tissue indicators such as mandibular angle (∠Co-Go-Me), mandibular expansion angle (∠Go-Me-Go), mandibular body length/mandibular support height ratio (Go-Me/Co-Go), mandibular angle width/zygomatic width ratio (Go-Go/Zy-Zy), and mandibular width index (Go-Go/Co-Co); and the soft tissue indicators included mandibular angle (∠t-go’-gn), mandibular angle width/midface width ratio (go’-go’/zy’-zy’), and mandibular angle width/mandibular height ratio (go’-go’/s-gn). The data were analyzed using SPSS 18.0 software, with normally distributed metric data expressed as Mean±SD. One-way analysis of variance or Kruskal-Wallis rank sum test was used to compare the three groups, and LSD method was used for comparison among prominent group, contrast group and attractive group. Fisher discriminant analysis was used for indicators with statistical significance. P<0.05 was considered statistically significant. Results:A total of 200 young females in Shanghai were enrolled in this study. 73 cases were included in the prominent group, with an age of (26.1±3.2) years, body weight of (54.3±4.3) kg, and body mass index(BMI) of (21.3±1.9) kg/m 2; 32 cases in the attractive group, with an age of (25.3±3.1) years, body weight of (58.7±3.7) kg, and BMI of (20.0±1.5) kg/m 2; and 95 cases in the contrast group, with an age of (27.2±3.7) years, body weight of (53.3±3.4) kg, and BMI of (20.1±1.3) kg/m 2. There were no significant differences in age, body weight, and BMI among the three groups ( P>0.05). There were significant differences in the measurement values of indicators such as ∠Co-Go-Me, ∠Go-Me-Go, Go-Me/Co-Go, Go-Go/Co-Co, ∠t-go’-gn among the three groups ( P<0.01). The prominent group showed significant outward and posterior protrusion in the mandibular angle area compared with the contrast group in terms of ∠Co-Go-Me (111.69°±4.19° vs. 115.43°±3.01°), ∠Go-Me-Go (66.27°±4.51° vs. 64.19°±3.69°), and ∠t-go’-gn (126.13°±7.51° vs. 130.34°±7.21°) ( P<0.01). The attractive group showed significant differences compared with the contrast group in terms of ∠Co-Go-Me (121.61°±3.22° vs. 115.43°±3.01°), Go-Me/Co-Go (1.67±0.20 vs. 1.58±0.15), and ∠t-go’-gn (137.17°±7.57° vs. 130.34°±7.21°) ( P<0.01). The lower quartile of ∠Co-Go-Me in the prominent group was 110°, and the upper quartile of ∠GO-Me-Go was 72°, with a small overlap in the mode region compared with the other two groups. Three indicators, ∠Co-Go-Me ( D1), ∠Go-Me-Go ( D2), and Go-Me/Co-Go ( D3), were selected to establish Fisher discriminant functions. The Fisher discriminant function for prominent group was Z=0.237 D2-0.084 D1-5.813, with a discriminant rate of 60.3%, and for the attractive group was Z=0.257 D1-0.015 D3-28.610, with a Fisher discriminant rate of 85.3%. Conclusion:The ∠Co-Go-Me, ∠Go-Me-Go, ∠t-go’-gn, and other data in Shanghai female youth can be used to evaluate their mandibular contour morphology, providing a reference for the diagnosis and treatment of mandibular angle prominent. The ∠Co-Go-Me of the mandibular aesthetic group should approach 122°, and ∠Co-Go-Me<110° and ∠Go-Me-Go>72° can be used as preliminary indicators for the diagnosis of mandibular angle prominent in prominent group, guiding clinical practice.
