奈米結構表面處理技術應用於顳顎關節鈦金屬植體之生物
力學行為分析

本研究的目的為研究從不同厚度的羥基磷灰石鍍膜(HA)和二氧化鈦(TiO2)表面處理技術於三維(3D)有限元模型顳顎關節(TMJ)植入物和骨頭之間界面上產生的應力分析。為了確保植體與骨組織之結合，應力為影響其骨整合速度之重要因素之一。表面處理應用於植入物是在臨床達到骨整合中一個非常重要的因素，已有許多顳顎關節之3D 模型研究已被廣泛討論，但幾乎沒有研究表面處理技術應用於顳顎關節植入物之力學分析。在這項研究中，顳顎關節模型使用電腦輔助分析法數據重建模型，並在顎運動時探討其應力場之受表面處理厚度之變化，此參數於顳顎關節植體尚未被廣泛研究。結果顯示最大應力發生在第一螺絲之位置，數據分析此最大應力於經過二氧化鈦表面處理過後之情況下應力減小非常明顯，此應力隨層厚度增加而減小。結果證實該表面處理術可增進顳顎關節植入物的力學性能，並減緩其異常之應力集中現象。

關鍵字

人工植入物；應力分布；表面處理技術

並列摘要

The purpose of this study was to investigate stresses resulting from different thicknesses of hydroxyapatite (HA) and titanium dioxide (TiO2) treated layers at the interface between temporomandibular joint (TMJ) implants and bones using three-dimensional (3D) 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 TiO2 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.