髁突
冯·米塞斯屈服准则
牙槽
颞下颌关节
口腔正畸科
流离失所(心理学)
咬合力商
牙周纤维
牙科
压力(语言学)
医学
牙列
窝
有限元法
解剖
结构工程
心理学
语言学
哲学
工程类
心理治疗师
作者
Wenli Huang,Lixin Dong,Shaoyang Yu,Yi Zheng,Hua Wu,Chenzhi Li,Yingyue Zhang,Qiang Zhang,Xiao Yan,Tao� Lv,Xiao Yuan
标识
DOI:10.1016/j.ortho.2023.100815
摘要
The modified clear twin-block aligner (CTBA) was developed to provide a mandibular advancement appliance for the treatment of mandibular retrognathia. The objective of this study was to analyse the stress distribution changes of CTBA with 45°, 60° and 70° bite blocks. A three-dimensional model of the craniomaxillofacial bones and teeth was generated from a spiral computed tomography (CT) scan. The models of the articular disc, capsule, periodontal ligament and CTBA were constructed mathematically. After assigning the appropriate material properties and the boundary condition using ABAQUS software, we simulated the CTBA with different bite blocks to analyse the mechanical effects. In the temporomandibular joint (TMJ) region, the posterior aspect of the condyle and glenoid fossa experienced tensile stress that was approximately about 22 times greater at 70° than at 45°. The Von Mises stress distribution on the articular disc tended to be uniform. The strain direction of the condyle was backward. In the maxillary bone, the stress on the labial alveolar bone was about 5.83 MPa at 70° and greater than that on the lingual side. The resulting displacement of the dentition revealed a tendency for the upper teeth to shift backward and the lower teeth to move forward by 0.46 to 0.49 mm. The foregoing stress and displacement rose as the angle of the bite blocks increased. CTBA with 70° bite blocks constituted an advantageous biomechanical setting for the treatment of mandibular retrognathia in teenagers and provided a superior therapeutic effect.
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