二氧化鈦表面處理在植體骨頭界面之生物機械性質

Abstract
The purpose of this study is to investigate stresses resulting from different thicknesses of hydroxyapatite (HA) and titanium dioxide (TiO2) coated layers at the interface between temporomandibular joint (TMJ) replacements and bone using three-dimensional (3D) finite element models. Coated layers on dental replacements are a very important factor in successful clinical application of these replacements. Several studies have investigated finite element models for TMJs, but few have examined a model for TMJ replacements with coated layers. In this study, TMJ models were reconstructed using computer tomography data, and the effects of coated layer thickness on the stress field during jaw movement were investigated; this index has not yet been reported with respect to TMJ replacement. The maximum stresses in the bone occurred at the position of the first screw and decreased with increasing coating thickness. Data analysis indicated a greater decrease in this stress in the case of using replacements coated with TiO2 and HA layers, but the decreases were not significantly different between the two. Results confirmed that the coating layers improve biomechanical properties of the TMJ replacements and release abnormal stress concentration in them. The results of our study offer the potential clinical benefit of inducing superior biomechanical behavior in the TMJ replacement.