本研究旨在開發一套轉移正顎手術計畫至術中的數位咬板產生程式。由於傳統咬板有手製變形量大、製作費時耗工、易受人為因素影響製作品質等缺點，故本研究提出以布林運算建立數位咬板的做法，以軟體加法設計技術有別於雷同研究以減法進行的方式，改善需事先建立無咬痕模板、無法解決干涉(Undercut)、無套合裕度等諸多問題。因此，為解決上述問題，本研究採由下而上(Bottom-up)的方式，取樣牙齒幾何外形作為建立咬板基底結構，由結構調整咬板牙痕外形以解決數位咬板安裝時所發生的干涉問題，並藉以擴張齒痕裕度。此外，設計自動調整咬板外形的演算方法，建立順沿齒列形狀且平滑的咬板外形，產生出客製化的數位咬板，並以快速成型(Rapid Prototype; RP)技術輸出為實體咬板後，利用實際案例進行驗證測試，驗證結果所獲得咬板設計平均誤差為0.269+-0.059mm與系統設計平均誤差為0.500+-0.196mm。總結而言，本研究提出的數位咬板設計方法需要針對不同的病例調整取樣精度，以降低套合卡阻問題，方可達到將手術計畫轉移至術中之目的。

The aim of this research is to build up a splint generated program for transferring orthognathic surgical planning to operation. Because of defects of traditional splint including multiple coordiates transformation, time consuming and manual errors. Some researchers employed Boolean different method to generated the digital splint have several pitfalls such as remodeling shape of the pre-build template, undercut and tolerence problems, In this study, we present a new method to solve above problems. Base on the surface modeling operation, we resample the shape of upper and lower crown of teeth to generate the fundamental structure of the splint, then adjusting bite prints to solve the problem of undercut and also expand teeth bite prints. Moreover, we present a new method to automatic adjust bite splint outlook along the arch in order to create smoothness. Finally, the physical splints are genereated by rapid prototype technology. We have verified deviations of the whole process which is 0.500+-0.196mm and, also accuracy of the generated bite splint is 0.269+-0.059mm. In conclusion, the method of designing digital splint can be used by modifying sampling accuracy to solve common undercut problems, which allow the digital bite splint successfully transfer surgical planning to be used in the operation room.

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