隨著醫療產業技術不斷地進步，牙醫手機軸承性能的優劣，將是左右牙醫手機性能的重要元件，選擇適當的軸承並發揮其優點，才能產生一支性能優異的牙醫手機。滾珠軸承具有可承受高負載及成本較低的優點，但不適用於高轉速與高精度的牙醫手機，若採用氣體軸承，則可突破使用滾珠軸承的極限，使牙醫手機主軸達到更高轉速及精度。
本研究針對不同供氣壓力、不同軸承間隙之牙醫手機氣體軸承的性能進行理論分析，數值模擬方法則是利用有限差分法求解雷諾方程式，藉由分析軸承的承載力、剛性等性能，最後進行牙醫手機實驗測試，利用實驗值與理論分析值比較，其誤差在1%左右，驗證本數值分析之可靠性，最後將建立一套完整的牙醫手機氣體軸承數值分析系統，提供未來牙醫氣體軸承手機設計及理論分析的基礎。

As the development of the medical technique, the bearings of dental hand piece are important components. Choosing the good bearings can make better performance of the dental hand piece. Ball bearings can suffer heavy load and cheap, but they can’t use on high-speed and great precision. In order to break through the limit of the ball bearings, air bearings can make dental hand piece high-speed and great precision.
The purpose of this paper is to analyze the performance of the air bearing of dental hand piece, Including the different pressure and different clearance. In the numerical analysis, To make use of Finite Difference Method to solve the Reynolds equation in order to analyze the performance of the air bearing, include load capacity、stiffness ,and etc. Finally, we had experiment on dental handpiece. To compare the experimental data with the theoretical data, we had a good comparison result. Last, we developed a numerical analysis for dental handpiece. The system can provide a useful tool to design the air bearing of dental handpiece.

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