义齿种植数字化导向装置建模技术研究

发布时间：2018-04-11 03:12

本文选题：导向装置 + 特征线　；参考：《南京航空航天大学》2017年硕士论文

【摘要】：自从口腔诊疗广泛普及CT技术后,口腔种植手术就逐渐从二维进入三维,临床上对于口腔种植辅助技术的需求也日益强烈。作为口腔种植手术重要的辅助工具,如何快速设计出口腔种植导向装置也成为了目前的研究热点之一。本文针对个性化义齿模型建模的特点,以及实际的临床需求,对义齿种植数字化导向装置建模的关键技术进行了研究。主要研究内容与学术成果如下:(1)针对传统的基于全局特征的特征线提取算法难以满足口腔种植手术导板特征线提取要求,本文提出了基于A*搜索策略的特征线提取算法。基于离散曲率微分确定每个节点的微分特性以及模型特征线提取临床需求,设计估值函数及对应的权重因子,计算得到光滑、闭合的牙齿特征线。(2)对于牙齿形态多样、个人差异化大等问题,本文研究了定量表示牙齿形态特征的方法,提出了基于统计模型的修复建模方法,参考缺损牙体残留信息与邻、对牙接触点等约束,结合贝叶斯后验概率,重建出符合临床需要的牙齿修复体。(3)针对现有牙齿局部解剖学形态变形操作受人工干扰因素较大,难以定量的问题,本文提出了参数化模型变形的算法,通过对平均牙冠进行变形操作,间接对牙冠模型进行变形,减少了人为因素对于牙冠变形的影响,实现了牙齿局部解剖学的参数化变形。在上述理论和算法的基础上,以VC++2008以及OpenGL为软件开发平台,实现了义齿种植导向装置数字化建模原型软件系统的开发,并制作出初步实物模型,取得了良好的临床效果。
[Abstract]:Since the widespread use of CT in oral diagnosis and treatment, dental implant surgery has gradually moved from two to three dimensions, and the need for dental implant assistive technology has become increasingly strong in clinic.As an important assistant tool for oral implant surgery, how to design the dental implant guidance device quickly has become one of the research hotspots.In this paper, according to the characteristics of personalized denture model modeling and the actual clinical needs, the key technology of digital guide device modeling for denture implant is studied.The main research contents and academic achievements are as follows: (1) aiming at the difficulty of traditional feature line extraction algorithm based on global features to meet the requirements of oral implant surgical guide line extraction, a feature line extraction algorithm based on A* search strategy is proposed in this paper.Based on discrete curvature differentiation to determine the differential characteristics of each node and model feature lines to extract clinical requirements, design the estimation function and the corresponding weight factor, calculate the smooth, closed tooth feature line.In this paper, the quantitative representation of tooth morphological characteristics is studied, and a statistical model-based restoration modeling method is proposed, which refers to the residual information of the defective tooth and its neighbors, and constrains the contact point of the tooth.Combined with Bayesian posteriori probability, the reconstruction of dental prosthesis, which meets the clinical needs, is proposed in this paper. In view of the problem that the operation of local anatomical morphologic deformation of teeth is affected by artificial interference factors and difficult to quantify, a parameterized model deformation algorithm is proposed in this paper.Through the operation of average crown deformation, the crown model was deformed indirectly, and the effect of artificial factors on crown deformation was reduced, and the parameterized deformation of tooth local anatomy was realized.On the basis of the above theory and algorithm, the prototype software system of digital modeling for denture guide device is developed with VC 2008 and OpenGL as the software development platform, and the preliminary physical model is made, and good clinical effect is obtained.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R783.6;TP311.52

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