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題 名 | 生醫金屬相對於骨水泥固定之微振磨耗影響的比較研究=Influence of Micro-motion Initiated by Relative Abrasions between Prosthetic Metallic Component and Bone Cement: Comparative Studies |
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作 者 | 廖峻德; 陳煌仁; 邱耀慶; 賴育誠; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 21:3 2001.09[民90.09] |
頁 次 | 頁183-190 |
分類號 | 416.26 |
關鍵詞 | 植入物固定; 微小位移運動; 磨耗; 粗糙度; Implant fixation; Micro-motion; Wear; Roughness; |
語 文 | 中文(Chinese) |
中文摘要 | 植入物與人體骨骼-肌肉系統間失去緊密貼合效果,致使固定界面之應力-應變的關係改變。對一負載維持在彈性區間的承受能力不同,固定界面之微小振幅造成相對摩擦而使附著表面間隙產生微小的移動,漸進產生塑性滑移,終而產生巨觀異位現象。以微振磨耗試驗機加以模擬,相對磨損材料使用鈦基合金、鈷基合金、316L不銹鋼對骨水泥,在微小位移量±40μm、前進之等速度為0.0014mm/s、一萬次、及荷重100N的參數下。實驗結果顯示:因側移時的摩擦阻力,造成微量力矩變化,界面接觸面積減少,形成局部邊緣摩擦現象。顯微觀察表面顯示:316L不銹鋼對骨水泥的殘屑堆積最少,鈦基合金與鈷基合金依序。三種金屬相對磨損有骨水泥殘屑黏著。粗糙度的測試顯示:三種金屬相對的骨水泥試片之X軸與Y軸方向的粗糙值無明顯的差異性(p>0.05);但平均粗糙度有上升的現象,依序為:鈦基合金、鈷基合金、316L不銹鋼。因漸進地產生滑移而降低界面附著力,界面磨耗鬆脫而釋出的殘屑粒子具加速骨水泥的脫離或使原有彈性區間的縮小,會加速髖骨柄的鬆動或往下沉移的作用。 |
英文摘要 | Fixation failure with musculo-skeletal system rises with fluctuations of stress-strain relation at the implant/tissue interface. Varied materials' responses differ in keeping their bearing capabilities. Micro-motion at the fixed interface is unavoidable; relative friction causes mobility between adhesive components and gradual increase of plastic strain, and eventually brings about macro-scale dislocation between implant and surrounding tissues. Using micro-motion tester simulates the occurrence of implant displacement at the inserted interface. The range of micro-motion was assigned as ±40μm per cycle with constant speed of 0.0014mm/s, moving forward for 10,000 cycles each, and under a bearing load of 100 N. Experimental result demonstrated that boundary friction caused micro-imbalance and thus reduced contact area; a localized edge effect was occurred. Further SEM observations and roughness tests provided that the fretting wear debris was generated in sequence: 316L stainless steel, Ti-based metal and Co-based metal. Along partial edge of Ti-base pin, small amount of PMMA particles were adhered. The roughness tests were corresponded to friction-to-wear mechanics: on both X and Y-axis among the post-tested bone cement did not differ obviously (p>0.05); however, the roughness of the surfaces was increased in sequence: Ti-based metal, Co-based metal and 316L stainless steel. It is thus not excluded that the inserted stem lost mechanical interlocks with bone cement; a gradual slip at the interface would decrease their adherence. The released species might facilitate and accelerate their detachment and diminish the elastic range and create loosening or shrinking effect to the inserted stem. |
本系統中英文摘要資訊取自各篇刊載內容。