Clinical finite element analysis of mandibular displacement model treated with Twin-block appliance

下颌骨(节肢动物口器) 髁突 有限元法 流离失所(心理学) 矢状面 颞下颌关节 口腔正畸科 锥束ct 医学 牙科 计算机断层摄影术 外科 结构工程 解剖 工程类 生物 植物 心理治疗师 心理学
作者
Yingyue Zhang,Xinyu Zheng,Qiang Zhang,Zijing He,Wenli Huang,Xiao Yan,Tao Lv,Xiao Yuan
出处
期刊:American Journal of Orthodontics and Dentofacial Orthopedics [Elsevier BV]
卷期号:164 (3): 395-405 被引量:10
标识
DOI:10.1016/j.ajodo.2023.02.012
摘要

•A new understanding of the clinical effect of Twin-block appliance was put forward. •Clinical use of Twin-block appliance can reduce temporomandibular joint burden and promote joint remodeling. •A new finite element analysis method, the remote displacement model, was examined. •The force on mandible of TB appliance was explained by finite element analysis. Introduction The mechanical distribution of the mandible is an important factor that affects functional orthosis during Twin-block (TB) appliance correction. Changes in the mandible before and after TB appliance correction are also key factors in maintaining the therapeutic effect. Finite element analysis, a powerful numerical, analytical tool, is widely used to predict the stress and strain distribution of the craniofacial bone that orthodontics generates. Methods The sample was a 14-year-old male patient with Class II malocclusion during growth. A cone-beam computed tomography scan was undertaken at pretreatment and posttreatment. In the Finite element analysis of the pretreatment model, the remote displacement model of the mandible was established with the sella point as the center. A mandibular model under TB appliance loading was established. Its mandibular displacement and von Mises stress were compared before and after loading. Three-dimensional registration was conducted on the pretreatment and posttreatment models to measure the sagittal displacement of the centrosome. Results The force on the mandible occurred mainly in the condyle neck and medial mandible after the TB appliance moved the mandible. After displacement, the posterior upper margin of the condyle was farther away from the articular fossa. Three-dimensional registration results showed that new bone had formed behind and above the condyle after TB appliance treatment. Conclusion The TB appliance provides additional advantages in treating skeletal Class II malocclusions by helping to reduce the burden on the temporomandibular joint and promoting the adaptive reconstruction of the mandible.
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