The Impact of Three Different Types of Twin-Block on Stress Distribution and Displacement of Anterior Teeth
10.16156/j.1004-7220.2025.04.007
- VernacularTitle:3种不同类型Twin-block矫治器对前牙应力分布和位移的影响
- Author:
Xingyu LI
1
;
Chunyan ZHANG
;
Xibei LI
;
Wenli HUANG
;
Shaoyang YU
;
Wenke YANG
;
Yingyue ZHANG
;
Jun GUO
;
Xiao YAN
;
Qiang ZHANG
;
Xiao YUAN
Author Information
1. 青岛大学附属医院口腔正畸科,山东青岛 266003;青岛大学口腔医学院,山东青岛 266023
- Publication Type:Journal Article
- Keywords:
twin-block appliance;
functional orthodontic treatment;
clear aligners;
class Ⅱ malocclusion;
anterior teeth
- From:
Journal of Medical Biomechanics
2025;40(4):844-850
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects of three types of twin-block(TB)appliances on the stress and displacement of anterior teeth,periodontal ligaments,and alveolar bone.Methods A three-dimensional(3D)finite element model was constructed,including maxillofacial bones,articular discs,teeth,and periodontal ligaments.Three types of twin-block appliances were designed:classic twin-block(classic-TB),twin-block with acrylic capping(capping-TB),and clear twin-block aligner(CTBA).All appliances had an inclination angle of 70°,and a masticatory force of 200 N was applied to their inclined planes.The finite element method was used to analyze the stress distribution and displacement differences of anterior teeth.Results All three types of TB appliances induced lingual tilting of maxillary anterior teeth and labial tilting of mandibular anterior teeth.The CTBA group showed the greatest lingual displacement and stress of maxillary anterior teeth,with a maximum stress of 30.6 MPa,while the mandibular anterior teeth in this group exhibited the smallest labial displacement(approximately 0.02 mm)and stress.Additionally,the CTBA group had the lowest compressive stress in mandibular anterior teeth,periodontal ligaments,and alveolar bone,whereas the classic-TB group had the highest.Conclusions In the treatment of Angle Class Ⅱ malocclusion,classic-TB(with or without acrylic capping)causes labial inclination of mandibular anterior teeth.Compared with classic-TB,CTBA effectively reduces the compressive stress and displacement of mandibular anterior teeth,potentially minimizing adverse periodontal risks.However,attention should be paid to the lingual displacement of maxillary anterior teeth.
