基于牙冠数据的牙齿建模方法研究

发布时间：2018-01-16 11:39

本文关键词：基于牙冠数据的牙齿建模方法研究　出处：《西安科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：三维数字化牙齿模型是计算机辅助口腔正畸系统的基础。在计算机辅助口腔正畸的过程中使用三维数字化牙齿模型不仅可以随时观测牙齿模型记录正畸治疗进展中的数据,同时也易于医生进行病案的讨论交流,为正畸远程网上诊断和治疗提供了信息载体。本文针对如何基于牙冠数据模型建立完整的牙齿模型进行了研究。本文首先对现有的三维数字化牙齿模型的获取方法及存储方法进行了简要的介绍,并分析了现有方法的优势与不足。针对目前获取三维数字化牙齿模型方法的优势与不足,本文提出了两种基于牙冠数据建立完整牙齿模型的方法。第一种建模方法是基于三维模型检索的牙齿建模方法,该方法利用三维检索技术查找与待建模牙冠具有相似牙冠的牙齿模型,通过三点平移变换法配准、裁剪和拼接完成建模工作。为了减少检索时的工作量,本文设计了一种基于区域分割的牙齿类型识别方法,该方法通过分析不同类型恒牙牙冠特征的差异,利用高斯曲率和平均曲率两种曲率描绘的曲面特征对牙冠表面进行区域分割。根据不同类型恒牙牙冠特征的差异和分割区域所描述的牙冠曲面特征对牙冠进行类型识别,对牙齿分类后,针对不同类型的牙齿分类进行检索。第二种建模方法是基于牙冠与牙根特征的牙齿建模方法,该方法利用对牙体测量数据的分析找出牙冠数据与牙根数据间的关联规则,根据这些关联规则及待建模牙冠数据计算出对应牙根部分的数据,最后使用样条曲线和Laplace变形等方法建立牙齿模型,其同样需要使用牙冠类型识别对牙冠进行分类建模。本课题通过VS2010和VTK编程实现上述算法,主要就算法的效率和建模结果进行对比分析,经试验两种建模方法的建模结果比较理想。
[Abstract]:Three-dimensional digital tooth model is the basis of computer-aided orthodontic system. The use of three-dimensional digital tooth model in the process of computer-aided orthodontic treatment can not only record the progress of orthodontic treatment at any time. The data in. It is also easy for doctors to discuss and exchange medical records. This paper studies how to build a complete tooth model based on crown data model. Firstly, this paper studies the acquirement of the existing 3D digital tooth model in order to provide information carrier for remote online diagnosis and treatment of orthodontics. The method and storage method are briefly introduced. The advantages and disadvantages of the existing methods are analyzed, and the advantages and disadvantages of the current methods for obtaining 3D digital tooth models are analyzed. In this paper, two methods of building complete tooth model based on crown data are proposed. The first method is based on 3D model retrieval. This method uses 3D retrieval technology to find the tooth model with similar crown to the crown under modeling, and completes the modeling work by means of three-point translation transformation registration, clipping and splicing, in order to reduce the workload of retrieval. In this paper, a method of tooth type recognition based on region segmentation is designed, which analyzes the differences of crown characteristics of different permanent teeth. The area of crown surface is segmented by the surface features of Gao Si curvature and mean curvature. The crown surface is classified according to the difference of crown characteristics of different types of permanent teeth and the surface feature of crown surface described by the segmentation region. Type identification. After tooth classification, different types of tooth classification are searched. The second method is based on tooth crown and root characteristics. The method uses the analysis of tooth measurement data to find out the association rules between the crown data and the root data, and calculates the corresponding root data according to these association rules and the tooth crown data to be modeled. Finally, the tooth model was established by spline curve and Laplace deformation. It also needs to use crown type recognition to classify and model the crown. In this paper, the algorithm is implemented by VS2010 and VTK programming, and the efficiency of the algorithm and modeling results are compared and analyzed. The experimental results of the two modeling methods are satisfactory.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：R783.5

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