Stress Distribution on Bone and Implant by Three-dimensional Finite Element Analysis

運用三維有限元素法分析骨頭與植體間之應力分析

鄭信忠(Hsin-Chung Cheng) ； 黃瓊芳(Chiung-Fang Huang) ； 沈永康(Yung-Kang Shen) ； 林儀(Yi Lin)

《中國機械工程學刊》 35卷5期 (2014/10) Pp. 389-395

摘要

口腔骨內植體使用於相對多顆牙齒發育不全之正畸錨定。在正畸負載下它們的效用已在臨床及實驗被重視。本文致力於骨頭與植體間三維有限元素模式建立。圍繞著植體應力分佈數值方法用於求取植體之最佳長度，直徑，螺旋樣式，螺旋間距及螺旋頭以備消散應力。數值模式應用於求取骨內植體及周圍組織的應力形成及分佈當骨內植體運用於正畸錨定。一個有螺紋的植體是種植於帶有皮質及松質骨的人類下顎缺牙段。應力分析顯示最大應力總是發生於邊緣骨之植體頸部。因此，這個區域臨床必須保護以維持骨頭植體之結構及功能。

並列摘要

Endosseous oral implants are used for orthodontic anchorage in subjects with multiple tooth agenesis. Their effectiveness under orthodontic loading has been demonstrated clinically and experimentally. This study examines three-dimensional (3D) finite element (FE) models for bone and implants. A numerical simulation of stress distributions around implants was used to determine the best length, diameter, screw type, screw pitch, and screw head for implants to dissipate stress. The model was applied to determine the pattern and distribution of stresses within the endosseous implant and on supporting tissues when the endosseous implant is used for orthodontic anchorage. A threaded implant was placed in an edentulous segment of a human mandible with cortical and cancellous bone. Analytical results demonstrate that maximum stresses were always located around the implant neck in marginal bone. Thus, this area should be preserved clinically to maintain the structure and function of a bone implant.

並列關鍵字

von Mises stress ； style of implant ； 3D finite element analysis