无托槽隐形矫治器远移尖牙的有限元分析

发布时间：2018-07-01 15:49

本文选题：隐形矫治器 + 尖牙　；参考：《浙江大学》2016年硕士论文

【摘要】：背景随着口腔正畸学科的蓬勃发展,正畸矫治器也发生了翻天覆地的变化,从1926年出现的方丝弓矫治器,到后来的直丝弓矫治器,随着人们生活水平的提高,以及材料学、计算机科学辅助技术的日新月异,一种看不见的托槽——无托槽隐形矫治器在正畸学科的应用也日益普遍,无托槽隐形矫治器发展近二十年,在临床上的应用越来越普遍,由于无托槽隐形矫治器受到热压膜材料限制,它在正畸过程中对控根移动牙齿,整体移动牙齿方面与固定矫治器相比,没有优势。而对于隐形矫治器对于牙齿正畸的作用机制以及应力加载模式,各种学术研究层出不穷,而有限元分析作为一种理论分析,在正畸学科的应用早已有之,本研究为分析尖牙远中移动构建模型,进一步做有限元分析。临床上通过增加附件,能较为有效地控制牙齿移动。有限元分析作为理论分析,通过构建牙槽骨-牙周膜-尖牙-隐形矫治器三维有限元分析模型,并顺利获得收敛的结果分析后,进行进一步的增加附件后的尖牙运动模型的理论分析,为临床上探索附件的生物力学作用以及附件的应用和设计探索可能性。方法1、在体外将牙齿模型通过3 Shape扫描仪获得牙齿的stl格式扫描数据。2、将牙齿模型数据导入CAD优化软件Rhino中进行布尔运算分割,获得牙周膜模型、牙槽骨模型、无托槽隐形矫治器模型,进行布尔装配,获得牙槽骨-牙周膜-尖牙-隐形矫治器模型。3、在尖牙牙冠临床冠中心添加—3*2*1mm的垂直矩形附件后,融合获得粘有附件的牙冠,该牙冠通过在表面法线方向扩大0.75mm获得隐形矫治器。布尔装配后,获得牙槽骨-牙周膜-尖牙-隐形矫治器模型。4、将模型以sat数据导入Abaqus软件中进行非线性接触分析。5、获得的网格模型取远中面的数个特征点进行位移分析,用origin科学制图软件进行分析位移。结果1、隐形矫治器通过施加强迫位移于尖牙,所构建模型单元数71699,总节点数为105502,应力集中于矫治器龈方,以及牙根中上2/3,隐形矫治器具有脱开的趋势,牙齿倾斜移动。2、增加垂直矩形附件后的尖牙,所构建模型单元数71699,总节点数为105502,隐形矫治器不再具有脱开的趋势,在隐形矫治器龈方有应力集中,牙根位移较为均匀分布,尖牙趋于整体移动。结论1、所构建的牙槽骨-牙周膜-尖牙-隐形矫治器模型仿真度较高,能较好的模拟隐形矫治器对尖牙受力分析。2隐形矫治器需要通过增加附件进行固位,同时通过附件改变牙齿的受力状态,来控制牙齿运动。3、通过体外增加附件并行有限元分析的方式来进行隐形矫治器的生物力学研究方法可行,增加垂直矩形附件能够使隐形矫治器的固位作用增强,并且能较为有效实现牙齿的整体移动。
[Abstract]:Background with the vigorous development of orthodontic discipline, the orthodontic appliance has also undergone tremendous changes. From the square wire appliance, which appeared in 1926, to the later straight wire appliance, with the improvement of people's living standard, as well as the material science and the computer science auxiliary technology, a kind of invisible brackets. The application of the orthodontic appliance in orthodontics is also becoming more and more common. The development of the non - braced stealth appliance is more and more popular in the past twenty years. As the non - braced stealth appliance is restricted by the hot pressing film material, it has no advantage in the orthodontic process of controlling the root moving teeth and moving the teeth as a whole with the fixed appliance. As for the mechanism of orthodontic effect and the stress loading mode of the orthodontic orthodontic appliance, various academic studies have come out in an endless stream. As a theoretical analysis, finite element analysis has been used in orthodontic discipline for a long time. This study is to analyze the model of the distal movement of the canine and make a further finite element analysis. It is more effective to control tooth movement. As a theoretical analysis, the finite element analysis is used to analyze the three-dimensional finite element analysis model of the alveolar bone - periodontal - canine stealth appliance and the results of the convergence. The theoretical analysis of the attachment of the tooth movement model is further added to explore the biomechanics of the appendage. The effect and the possibility of the application and design of the attachment. Method 1, in vitro, the tooth model was obtained through the 3 Shape scanner to obtain the STL format scanning data.2, and the tooth model data was introduced into the CAD optimization software Rhino for the Boolean operation segmentation, and the periodontal membrane model, the tooth bone model, the non troughless stealth appliance model, and the cloth were carried out. The alveolar bone - the periodontal ligament and the canine stealth appliance model.3 was obtained. After adding the vertical rectangular appendage to the Crown Center of the canine crown, the dental crown was fused with the attached attachment. The crown was obtained by expanding 0.75mm in the surface normal direction. The alveolar bone - periodontal membrane - canine - stealth was obtained after the assembly of the crown. The appliance model.4, the model takes sat data into Abaqus software to carry on the nonlinear contact analysis.5, the obtained grid model takes several characteristic points of the far middle surface to carry on the displacement analysis, and uses the origin scientific drawing software to analyze the displacement. Results 1, the stealth appliance is constructed by forcing the forced displacement to the canine, the number of the model units is 71699, the general section is constructed. The point number is 105502, the stress concentrates on the orthodontic gingival square, and the upper 2/3 in the root of the tooth. The stealth appliance has the tendency to disconnect. The tooth inclines to move.2 and increases the canine of the vertical rectangular appendage. The number of the model units is 71699, the total node number is 105502. The stealth appliance no longer has the tendency to disconnect, and there is a stress concentration in the gingival square of the stealth appliance. The tooth root displacement is more evenly distributed and the canine tends to move to the whole. Conclusion 1, the model of the alveolar bone, periodontal ligament and canine stealth appliance model has high simulation degree, and it can simulate the force analysis of the canine with better simulation of the stealth appliance. The.2 stealth appliance needs to be repositioned by adding attachments, and the force state of the teeth is changed by attachments. It is feasible to carry out the biomechanical research method of the stealth appliance by adding attachment and finite element analysis in vitro, and increasing the vertical rectangular appendage can enhance the retention of the stealth appliance, and can effectively realize the movement of the teeth in.3.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：R783.5

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