- 學位論文
快速義齒鑲製系統關鍵幾何之量測與重建
The crucial geometry measurement and reconstruction for rapid tooth restoration system
摘要
近年來由於市場的需求，牙醫師希望能夠讓牙齒病患在最短時間內完成鑲牙程序，對於義齒的鑲製過程強調快速、精確，因此設計製造義齒的技術已經由傳統的印製齒模或精密脫蠟鑄造法，發展至今的數位化牙齒模型。但是由於義齒鑲製過程並不需要完整的義齒幾何模型，而只需要義齒與牙床關鍵接觸曲面和邊緣線。 本研究將採用非接觸式光學立體視覺量測技術，重建義齒鑲製過程所需的關鍵接觸面和邊緣線。此技術直接將物體的三維座標與其對應的平面影像座標資訊，利用類神經網路建立映射關係的運算機制(mechanism)，此機制的量測空間設定在15×15×28 mm。根據假牙文獻建議，假牙誤差需再0.025mm~0.05mm內，而本研究系統的量測精度在0.045mm以內，顯示本文所使用的方法可滿足義齒重建所需之精度。
並列摘要
The dentists always desire to finish the processes for tooth restorations as quickly as possible for the sake of the market need. Because the processes for tooth restorations put emphasis upon efficiency and accuracy, the techni- que of false tooth design/fabrication becomes so far a tendency towards dig- ital dentistry instead of traditional dental cast. It is not mecessary for compl ete tooth geometry model during tooth restorations. According to clinical of dentists, it only needs crucial contact surfaces and margins betewwn gum and denture. In this research, non-contact optical stereos vision measurement is applie d to reconstruct the key of contact surface and margin that tooth restorations need. The mechanism that constructs the mapping relation between a 3-D co- ordinate in real space and a 2-D coordinate in corresponded image was built by neural network, and the measure space of it was set 15×15×28 mm.As suggested denture mold articles, the error margin should be within 0.025mm 3 ~0.05mm. In this research, the data from measuring stardard objects was me- asured with the system to have accuracy of 0.045mm, which satisfies the requirement of practical applicatioms.