前期研究建立的正顎手術計劃專用導航咬合器系統—Nart(Navigational Articulator)，可量化上下顎對稱度、咬合關係、測顱，及產生對稱評估指標，至今人體臨床試驗案例已超過200例。本研究基於Nart系統發展正顎手術術中導航系統，以手術計劃為導航目標，利用結合標記的數位咬片做為光學追蹤來源，開發術中軟體追蹤上、下顎位置，計算對稱評估指標，指引計劃目標等功能，利用術中必要的咬片產生即時正顎導航資訊，提供專案儲存，供術後分析比對使用。
本研究目標以in Vitro實驗驗證整體系統精度，選用Nart系統規劃且已執行過正顎手術的手術案例進行導航。同一案例重複導航實作五次，結果顯示上顎誤差1~3mm最大誤差範圍2~4mm，下顎誤差2~4mm最大誤差範圍4~9mm，雖概念可行，但在臨床上尚無法使用，本文探討造成實驗誤差原因，提供後續研究者參考改善。

Nart (Navigational Articulator), a navigational articulator system for the surgical planning of orthognathic surgery developed in previous study, is capable to quantify the symmetry status of maxilla and mandible, real-time track the occlusion relationship, the cephalometry, and the symmetry index. Base on the Nart planning system, we developed an intraoperative navigation device for orthognathic surgery. The surgical planning was defined as navigational target, marker combined with the digital splint was used as the tracking subject. The developed software can track the movements of both maxilla and mandible, calculate the symmetry index, guide both maxilla and mandible to the planning positions, and the use of intraoperative splints to show above information simultaneously. We also provide project store and restore for further postoperative evaluation in the navigation system.
Aim of this study is to verify the feasibility and accuracy of the overall system by in Vitro experiment. The experimental environment employed one of the past cases of orthognathic surgery which used the Nart system for planning, applying the experiment five times at the case. The result shows that errors of maxilla navigation was from 1mm to 3mm, and the maximum error among 2~4mm. The error of mandible navigation was from 2mm to 4mm, ranges of the maximum error was from 4mm to 9mm. Although the concept is feasible, it is clinically unacceptable. In this dissertation, the author explore the causes of errors and provides suggestions of further works for follow-up researchers.

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