Department of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan.
J Biomed Mater Res A. 2013 Apr;101(4):1195-200. doi: 10.1002/jbm.a.34404. Epub 2013 Jan 24.
The purpose of this study was to investigate stresses resulting from different thicknesses of hydroxyapatite- and titanium dioxide (TiO(2))-treated layers at the interface between temporomandibular joint (TMJ) implants and bones using three-dimensional finite element models. For ensuring osseointegration of implant treatment, one must examine the stresses of interface between implant and bone tissue. Treated layers on TMJ implants are a very important factor in clinical application. Several studies have investigated finite element models for TMJs, but few have examined a model for TMJ implants with treated layers. In this study, TMJ models were reconstructed using computer tomography data, and the effects of treated layer thickness on the stress field during jaw movement were investigated; this index has not yet been reported with respect to TMJ implant. The maximum stresses in the bone occurred at the position of the first screw. Data analysis indicated a greater decrease in this stress in the case of using TMJ implants with TiO(2)-treated layers, and the stresses decreased with increasing layer thicknesses. Results confirmed that the treated layers improve biomechanical properties of the TMJ implants and release abnormal stress concentration in them. The results of our study offer the potential clinical benefit of inducing superior biomechanical behavior in TMJ implants.
本研究旨在通过三维有限元模型研究不同厚度的羟基磷灰石和二氧化钛（TiO2）处理层在颞下颌关节（TMJ）植入物和骨骼界面处产生的应力。为了确保植入物治疗的骨整合，必须检查植入物和骨组织界面的应力。TMJ 植入物上的处理层是临床应用中非常重要的因素。已有几项研究调查了 TMJ 的有限元模型，但很少有研究检查具有处理层的 TMJ 植入物模型。在这项研究中，使用计算机断层扫描数据重建 TMJ 模型，并研究了处理层厚度对下颌运动过程中应力场的影响；关于 TMJ 植入物，尚未报道过该指标。骨中的最大应力出现在第一个螺钉的位置。数据分析表明，使用具有 TiO2 处理层的 TMJ 植入物时，该应力的下降幅度更大，并且随着层厚度的增加，应力会下降。结果证实，处理层改善了 TMJ 植入物的生物力学性能，并减轻了其中异常的应力集中。我们的研究结果为 TMJ 植入物产生优越的生物力学行为提供了潜在的临床益处。
