隨著牙科醫療服務業的普及，牙醫診所已經融入我們生活當中，看牙是再正常不過的行為，加上全球牙科醫療市場的增長，國內外都有許多牙科相關設備廠商都要搶攻這龐大的市場商機，然而牙科醫療設備研發也是有門檻技術的，尤其像是高速牙科手機，國外的大廠早已取得技術上遙遙的領先，然而牙科手機為口腔治療過程中最重要的工具，一般牙科手機分為高速牙科和低速牙科手機，其中高速牙科手機有較好的性能所以常被使用，因為高速空氣渦輪手機是利用驅動氣體為動力源，所以在氣體衝擊渦輪葉後帶動轉軸高速旋轉，轉速可達大約每分鐘30~45萬轉，同時牙科手機也有振動和噪音的問題，若是轉子不平衡或是有損壞，其運轉時會產生異常的高頻率振動和噪音。
在牙科臨床治療上，若牙科治療人員長時間使用相關牙科治療器材，對手部會感到麻木、刺痛等不舒適之症狀，因為當手部接觸振動手工具會對手部有傷害造成，故不可忽略高頻振動可能引起的手部疾病。
本研究針對高速牙科手機做模擬分析，建立牙科手機有限元素模型，為了探討如何減少牙科手機之振動，所以設計三種減振方法進行模擬，給定相同的輸入條件，而改變其結構模擬設定，探討在手指位置上振動位移之響應，藉由頻譜分析得知在不同頻率下的減振效果，利用方均根值比較振幅之大小，最後做結果整理與分析，比較不同減振設計下之減振效果，接著利用得到之振動位移曲線，結合手部對牙科手機半圓管之模型進行模擬，使用VPAD評估法比較三種減振設計對手指軟組織承受的振動能量大小，結論發現附加阻尼對結構振動的傳遞有一定的減振效果，故之後減振設計要選用何種阻尼和幾何結構來減振是一個未來可以探討的問題之一。

With the popularity of the dental medical service, dental clinics have been integrated into our lives. It is very common that everyone would go to see a dentist at least once per year. Hence, there will be a great potential in the global market. For example, the high-speed dental handpiece, which is a very important tool through the operation. Dental handpieces classified as the high-speed and the low-speed dental handpiece, of which the high speed one is often used due to its high performance. The rotation speed of high speed dental handpiece can reach about 300,000 to 500,000 rpm. However, there is a big issue about the vibration and noise problems during the operation. In clinical treatment, if the dentist uses the high-frequency vibrating hand tool for a long time, the user's hand may feel numbness, tingling and other uncomfortable symptoms.
So this study focus on simulating the model of high-speed dental handpiece and establish the finite element model of the dental handpiece. In order to explore how to reduce the vibration of the dental handpiece, three kinds of vibration-damping methods are designed to solve this problem. In the response of the vibration displacement at the fingertip position, the vibration damping effect at different frequencies is obtained by spectrum analysis, and the magnitude of the amplitude is compared by using the root mean square value.
In conclusion, using finite element simulations the vibration reduction results are compared and analyzed between the different design methods.

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