Study on the ideal sagittal position of the lower third of the face in high-angle patients with different forehead forms
10.12016/j.issn.2096-1456.2023.11.005
- Author:
LI Linzhu
1
,
2
;
ZHOU Jing
1
,
2
;
HUANG Chao
1
,
2
;
LI Peilin
1
,
2
;
TANG Tian
1
,
2
Author Information
1. State Key Laboratory of Oral Diseases &
2. National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University
- Publication Type:Journal Article
- Keywords:
forehead / profile esthetic / high angle / skeletal Class I / position of incisor / facial silhouettes / orthodontics / scoring system
- From:
Journal of Prevention and Treatment for Stomatological Diseases
2023;31(11):794-800
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore the ideal sagittal position of the lower third of the face in high-angle patients with different forehead forms and to provide a reference for clinical treatment.
Methods:Informed consent and portrait authorization were obtained from all patients, and the study passed the ethical review of the unit. We categorized forehead forms into four types: straight, rounded, type I angular (angled at the middle third of the forehead) and type II angular (angled at the upper third of the forehead). Profiles of high-angle patients with different forehead forms were collected. The initial position was when the facial axis point (FA point) was positioned at the goal anterior-limit line (GALL). After being silhouetted, the lower third of the face was moved forward and backward by 1 mm, 2 mm, 3 mm, and 4 mm each, plus the initial silhouetted picture, to obtain 9 images for each patient. A survey was created with these lateral profile silhouettes, and the silhouette images were ranked by 30 orthodontists and 30 laypersons.
Results: There were significant differences in profile scores at different movement distances of the lower third of the face among high-angle patients with different forehead shapes (P<0.05). Overall, high-angle patients with straight or type II angular foreheads had higher scores when the lower third of the face did not move. For high-angle patients with a rounded forehead, orthodontists and laypersons gave the highest scores when the lower third of the face was moved backward by 2 mm and 4 mm, respectively. For high-angle patients with a type I angular forehead, orthodontists thought the scores of backward movement of 4 mm were the highest, and laypersons thought the scores of backward movement of 3 mm were the highest. No significant difference was found in scores between orthodontists and laypersons (P>0.05).
Conclusion :The forehead forms and the sagittal position of the lower third of the face will affect the face’s profile aesthetics. Patients with straight and type Ⅱ angular foreheads has the best profile when the FA point is located on the GALL line. For patients with rounded and type Ⅰ angular foreheads, a posterior location of the lower third of the face is more desirable than the initial position.
- Full text:不同前额形态高角患者面下1_3理想矢状向位置的研究.pdf
