CAD/CAM的加工方式已被廣泛的應用在義齒的贗複技術上，然而現有的三軸加工方式應用於複雜的3D曲面上仍有加工上的限制，五軸加工方式則較三軸有較高的材料移除率、良好加工表面以及減少手動修型等優點。因此本論文使用特殊的五軸加工平刃與尖刃刀具，以不同的刀具直徑或刀具傾角及不同的鑽石磨粒粒度大小，，研究可切削陶瓷(Vita Mark Ⅱ)的切削特性。主要的切削參數為進給速度及切深，實驗結果顯示，透過陶瓷工件的表面微觀檢測(SEM)與表面粗糙度，可確定齒材與參數間的被削性關係，並找出適用的刀具與切削參數，以供實際加工時使用。

Dental CAD/CAM system has been commonly used while the current three-axis dental CAD/CAM system cannot achieve complex shapes. The five-axis machining of sculptured surface offers many advantages, including faster material removal rates, improved surface finish and elimination of hand finish. The machining data for five-axis numerical control (NC) machining were investigated in this study using special flat-end and sharp-end tools coated with diamond abrasives of different grit sizes. The major machining parameters include feed rate and depth of cut. The dental ceramics selected for this study was Vita MarkⅡ. The surface conditions of ceramics are analyzed with SEM and the surface profiler. The relations between surface roughness and machining parameters were found. The experimental results reveal the suitable machining data for five-axis dental CAD/CAM system. Principles of tool and machining conditions selection were suggested as well. The obtained results can be used in the five-axis dental system.

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