目前植牙技術已廣泛運用至牙科手術上，因此術後成功與否為研究關切的問 題。本研究利用共振頻率法進行植體/齒槽骨結構缺損程度、方位檢測，並利用 有限元素法進行模態分析，相互比較驗證。 第一階段實驗針對植體/齒槽骨結構進行方位缺損檢測，藉由植體植入不同 骨缺損模型後量測各方位共振頻率，判斷齒槽骨缺損方向，並由植體/齒槽骨缺 損結構所呈現之頻率變化，評估植體與周圍骨組織整合的程度，同時由數值模擬 進行模態分析，相互比較驗證。第二階段實驗改變齒槽骨前後夾持高度模擬個體 之間差異，作為缺損程度檢測依據，因此後續建立骨缺損程度診斷機制，歸納此 檢測機制並進行模擬驗證，將此結果提供於臨床植牙手術，作為術後參考依據。 歸納共振頻率變化趨勢與骨缺損程度及方位之關係，針對個體骨缺損情況建 立有效的骨缺損位置檢測技術，期能改善臨床常用X 光二維影像判讀之不足、 僅以結構共振頻率呈現整體現象之缺點，進而協助醫生監測病患局部骨缺損及過 續補強，以提高植牙手術的成功率。 The dental implant is generally used in patients who are edentulous and missing natural tooth. This study is based on the resonant frequency response to specify criteria for examining the defect direction and defect severity in the bone of dental implant. Both the finite element analysis and the experimental modal analysis are applied to compare the differences between experiment and simulation. In the first stage, resonance frequency analysis (RFA) was applied to estimate stability of bone-implant structure in full size. The variation of RF was used to locate the direction of bone that was non-ossestintegration. The resonance frequency (RF) increased substantially as better stability of bone-implant structure was achieved. In the second stage, The boundary condition was varied to simulate different mandible. The RF with different boundary was used to decide defect type. Then, we collated those data and defined a criterion to detect the defect bone depth with dental implant. The three detection steps include that using the severe RF to decide the mandible type, locating the direction of defect bone, and deciding the defect type. In the end, we prove that RFA was effective method for examining the defect direction and defect severity in the bone of dental implant.