Liu Zhan, Qian Yingli, Zhang Yuanli, Fan Yubo
a Provincial Key Laboratory of Biomechanical Engineering , Sichuan University , Chengdu , Sichuan , P.R. China.
b Strength Design Department, AVIC 611 Institute , Chengdu , Sichuan , P.R. China.
Comput Methods Biomech Biomed Engin. 2016;19(2):137-43. doi: 10.1080/10255842.2014.996876. Epub 2015 Jan 14.
The aim of this study was to evaluate stress distributions in the temporomandibular joints (TMJs) with temporomandibular disorders (TMDs) for comparison with healthy TMJs. A model of mandible and normal TMJs was developed according to CT images. The interfaces between the discs and the articular cartilages were treated as contact elements. Nonlinear cable elements were used to simulate disc attachments. Based on this model, seven models of various TMDs were established. The maximum stresses of the discs with anterior, posterior, medial and lateral disc displacement (ADD, PDD, MDD and LDD) were 12.09, 9.33, 10.71 and 6.07 times magnitude of the identically normal disc, respectively. The maximum stresses of the posterior articular eminences in ADD, PDD, MDD, LDD, relaxation of posterior attachments and disc perforation models were 21, 59, 46, 21, 13 and 15 times greater than the normal model, respectively. TMDs could cause increased stresses in the discs and posterior articular eminences.
本研究的目的是评估患有颞下颌关节紊乱病（TMDs）的颞下颌关节（TMJs）中的应力分布，以便与健康的颞下颌关节进行比较。根据CT图像建立了下颌骨和正常颞下颌关节的模型。椎间盘与关节软骨之间的界面被视为接触单元。使用非线性索单元模拟椎间盘附着。基于该模型，建立了七种不同TMDs的模型。伴有前、后、内侧和外侧椎间盘移位（ADD、PDD、MDD和LDD）的椎间盘的最大应力分别是正常椎间盘的12.09、9.33、10.71和6.07倍。ADD、PDD、MDD、LDD、后附着松弛和椎间盘穿孔模型中后关节结节的最大应力分别比正常模型大21、59、46、21、13和15倍。颞下颌关节紊乱病可导致椎间盘和后关节结节应力增加。
