Hsu Jui-Ting, Huang Heng-Li, Tsai Ming-Tzu, Fuh Lih-Jyh, Tu Ming-Gene
China Medical University School of Dentistry and College of Medicine, Taichung, Taiwan, Republic of China.
J Oral Maxillofac Surg. 2011 May;69(5):1320-8. doi: 10.1016/j.joms.2010.05.074. Epub 2011 Jan 8.
The objective of the present study was to evaluate the effect of the number of screws on the stress and stability of the temporomandibular joint (TMJ) condylar prosthesis and on the strain distribution in the bone.
Three-dimensional, finite element models of the mandible and a TMJ condylar prosthesis with fixations involving different numbers of screws in 8 configurations were established to investigate the effect of the number of fixed screws on the stress and stability of the implant and strain in cortical and cancellous bone.
The simulations showed that increasing the number of screws beyond 3 only slightly enhanced the implant stability and reduced the implant stress. The position of the inserted screws significantly affected the strain distributions in cortical and cancellous bone tissues.
The results of our study have shown that 3 staggered screws can provide optimal implant stability and bone stress and strain distributions in a TMJ condylar prosthesis.
本研究的目的是评估螺钉数量对颞下颌关节（TMJ）髁突假体的应力和稳定性以及骨内应变分布的影响。
建立下颌骨和TMJ髁突假体的三维有限元模型，其固定涉及8种配置中不同数量的螺钉，以研究固定螺钉数量对植入物的应力和稳定性以及皮质骨和松质骨应变的影响。
模拟结果表明，螺钉数量增加超过3颗时，仅略微增强了植入物的稳定性并降低了植入物应力。插入螺钉的位置显著影响皮质骨和松质骨组织中的应变分布。
我们的研究结果表明，3颗交错螺钉可为TMJ髁突假体提供最佳的植入物稳定性以及骨应力和应变分布。
