Dynamic Stress Analysis and Optimization Design of a New ITI Dental Implant

[[abstract]]本研究結合ITI牙根與Nano-Tite牙根之特徵凹孔，設計出一款新式的ITI人工牙根，使其具有降低微位移的優點。以均勻實驗設計法規劃多因子多水準之實驗組合，利用ANSYS/LS-DYNA分析每一個實驗下人工牙根之微位移。在取得所有實驗之微位移數據後，再應用克利金插值法建立微位移之克利金代理模型。最後將克利金代理模型視為目標函數，以微位移最小化為目標，透過基因演算法與序列二次規劃法求解人工牙根設計變數之最佳設計解。研究結果顯示，利用克利金代理模型求解牙根微位移之最佳解為60.58μm，經由模型驗證誤差為1.44%符合誤差基準值3%以內。藉由敏感度分析探討單因子變化，發現上圓角度及上圓半徑對微位移之敏感性最大，所以往後變更設計時需多加注意。[[abstract]]Combining the characteristics of ITI dental implant and the Nano-Tite dental implant of concave hole, a new ITI dental implant has been constructed in this paper. In order to achieve the optimal design of dental implant, the uniform experimental design is used to plan a set of experiments with multiple factors and multiple levels. Secondly, the nonlinear finite element analysis tool ANSYS/LS-DYNA is used to analyze the micro-motion of dental implant for each experiment. Thirdly, based on the results of experiments, the Kriging interpolation is used to construct the surrogate model of micro-motion, which is treated as the objective function. Finally, under the goal of minimize micro-motion, the optimal settings for the parameters of dental implant are solved by using a genetic algorithm and the sequential quadratic programming method. The study results show that using Kriging surrogate model for solving the root micro displacement of the optimal solution for 60.58μm, Through model validation, the error reference value of 1.44%, comply with the model validation error of 3%.Single factor changes sensitivity analysis found fillet radius is the maximum sensitivity of the micromotion, so change the design in the future need to pay attention