發(fā)布時(shí)間：2018-11-20 18:50

【摘要】：隨著數(shù)字化技術(shù)在口腔修復(fù)領(lǐng)域的不斷推廣和應(yīng)用,臨床上對牙體的預(yù)備開始從傳統(tǒng)的純手工操作方式慢慢向借助輔助裝置操作方式轉(zhuǎn)變。利用數(shù)字化牙體預(yù)備導(dǎo)板裝置不但能制備出更高精度的預(yù)備體,而且能大幅地提高手術(shù)效率,這將必定成為未來的主流治療手段。本文針對牙體預(yù)備導(dǎo)板的臨床應(yīng)用特點(diǎn),對牙體預(yù)備導(dǎo)板建模的關(guān)鍵技術(shù)進(jìn)行了研究,主要研究內(nèi)容和成果如下:(1)針對牙齒網(wǎng)格模型上的齦緣線獲取,研究了一種基于曲率特征信息的自適應(yīng)的提取算法�；谇侍卣餍畔⒋_定特征點(diǎn)候選區(qū)域,憑借數(shù)理統(tǒng)計(jì)中相關(guān)系數(shù)動(dòng)態(tài)確定搜索半徑,以主成分的主方向?yàn)橐龑?dǎo)方向,自適應(yīng)的迭代搜索特征點(diǎn),并進(jìn)行曲線擬合,得到光滑封閉的齦緣線。(2)針對預(yù)備導(dǎo)板支撐體的構(gòu)建,提出了一種基于過渡截面的掃掠建模方法。在掃掠路徑曲線的各節(jié)點(diǎn)處插入過渡截面,利用投影的方法獲得各截面上的輪廓曲線,形成掃掠曲面,并通過插入隨機(jī)離散點(diǎn)和Delaunay三角剖分方法獲得封閉的掃掠體。(3)研究了三角網(wǎng)格軸面導(dǎo)軌模型的離散參數(shù)化建模技術(shù)。通過分析牙科車針和預(yù)備體之間的約束關(guān)系,確定軸面導(dǎo)軌的尺寸約束模型,實(shí)現(xiàn)了軸面導(dǎo)軌的參數(shù)化建模,并基于歷史模型實(shí)現(xiàn)導(dǎo)軌模型的動(dòng)態(tài)更新。在上述研究理論成果基礎(chǔ)上,以VS2008為平臺(tái)以及基于OpenGL圖形庫,完成了個(gè)性化牙體預(yù)備導(dǎo)板數(shù)字化建模軟件模塊的開發(fā),并通過實(shí)例驗(yàn)證了系統(tǒng)的有效性和穩(wěn)定性。
[Abstract]:With the development and application of digital technology in the field of dental prosthesis, the clinical preparation of teeth has gradually changed from the traditional manual operation to the operation with the aid of auxiliary devices. The use of digital dental preparation guide device can not only produce a higher accuracy of the preparation, but also greatly improve the efficiency of surgery, which will certainly become the mainstream treatment in the future. According to the clinical application characteristics of dental prefabricated guide plate, this paper studies the key technology of tooth preparation guide plate modeling. The main research contents and results are as follows: (1) for the gingival margin line acquisition on the tooth mesh model, An adaptive extraction algorithm based on curvature feature information is studied. The candidate regions of feature points are determined based on curvature feature information. The search radius is dynamically determined by the correlation coefficient in mathematical statistics. The principal direction of principal component is used as the guide direction, and the feature points are searched adaptively by iteration, and the curve fitting is carried out. A smooth and closed gingival margin line is obtained. (2) A sweeping modeling method based on transition section is proposed for the construction of pre-guide plate support. The transition section is inserted at each node of the sweep path curve, and the contour curve on each section is obtained by projection method, and the swept surface is formed. The closed swept body is obtained by inserting random discrete points and Delaunay triangulation. (3) the discrete parameterized modeling technique of triangular grid axial guide rail model is studied. Based on the analysis of the constraint relationship between the dental needle and the preparatory body, the dimension constraint model of the axial guide rail is determined, and the parametric modeling of the axial guide rail is realized, and the dynamic updating of the guide rail model is realized based on the historical model. On the basis of the above theoretical research results, the digital modeling software module of individualized dental preparatory guide plate is developed on the platform of VS2008 and based on OpenGL graphics library, and the validity and stability of the system are verified by an example.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：R783;TP391.7

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