近年來貴金屬價格飛漲，為了降低製作牙橋的成本，本研究分別以理論與實驗方法探討當臼齒區的牙橋金屬結構採用空心設計，再填以陶瓷材料時，對其機械強度的影響。牙橋主要的外型係由高解析度電腦斷層掃描儀(Micro CT)建立，由於X光無法穿透真實牙橋，本研究係以蠟製成極相似的模型來掃描建模，並以有限元素法(Finite element method)模擬橋體支架受到不同負載時的應力分布及形變，此研究的負載分成中間橋體受力與三個咬合面受力兩種情況。實驗部分以數位影像相關法(Digital image correlation method)探討牙橋受力後的形變輔以壓電材料探討牙橋內部應力，實驗皆由萬能材料試驗機施力，條件設定與模擬一致。模擬結果顯示牙橋連接體處應力值較高、三個咬合面受力的應力值會大於中間橋體受力、牙橋外部陶瓷應力會大於內部金屬、內部金屬支架所填的陶瓷愈多則兩種材料應力愈大；實驗結果觀察到X方向位移趨勢與模擬一致、實驗後的牙橋在中間橋體有破壞，結果與模擬時預估從咬合面應力較大處開始產生裂縫一致、本研究並獲得未包埋前的壓電特性，之後待包埋進牙橋後獲得相關電荷數據加以對照後即可得知內部應力大小。

The precious metal prices have soared in recent years. To reduce the production costs of dental bridge, we use theoretical and experimental methods to investigate mechanical strength of the bridge, which is hollow designed in metal bracket and filled with ceramics. The shape of bridge is decided from Micro CT. X-ray is unable to penetrate the bridge, so we use dental bridge made of wax which is very similar to real bridge to scan. After scanning, the figure is used to establish the simulation model. We use Finite element method to calculate von-Mises stress and displacement under different loading. Two different loading conditions including distributive loadings exerted on the middle of the bridge and three occlusal face, respectively, are adopted in analysis. Digital image correlation method is used to investigate deformation and piezoelectric material is used to investigate internal stress of the bridge. The force of the two experiments are given by tensile testing machine and the condition is set to be consistent with simulation. Simulation results show that the stress is bigger at the connector of the bridge. The stress loading on three occlusal face is bigger than that on the middle of the bridge. The stress of external ceramic is bigger than internal metal. The more ceramic filled in internal bridge bracket, the bigger stress is induced in two different materials. It shows that the trend of experimental results including the X-directional displacement and the destruction happened at the middle of the bridge are consistent with simulation results. Pre-embedded piezoelectric material properties is also obtained in this study. As the piezoelectric material is embedded in dental bridge and related charge data is measured, the internal von-Mises stress can be obtained accordingly.

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