纤维桩修复不同形态上颌尖牙根管有限元分析及其3D打印技术研究
发布时间：2019-06-03 08:30
【摘要】：目的利用三维有限元分析方法对纤维桩修复正常形态和漏斗状根管上颌尖牙进行动力学和疲劳失效机理分析,揭示修复后牙齿在使用过程中发生疲劳失效的机制,为临床上纤维桩修复后牙齿的寿命预测和抗疲劳性的提升提供理论基础。在此基础上,利用3D打印技术定制不同形态根管桩核冠修复后牙齿各部分应力分布状况,为其在临床的修复应用提供理论依据。方法1.基于三坐标测量机对牙齿模型进行扫描获得牙齿的点云数据,利用逆向工程软件Geomagic Studio对点云数据进行重构,再利NX UG软件的CAD模块建立修复体三维模型。2.利用预成纤维桩分别对正常形态根管和漏斗形态根管的牙体进行修复,基于三维有限元法分析修复后牙体的应力—应变情况,并基于SWT疲劳寿命分析准则对修复后牙体进行疲劳寿命预测。3.利用3D打印纤维桩和预成纤维桩分别对正常形态根管和漏斗形态根管牙体进行修复,并基于三维有限元法分析并比较两种系统修复不同形态根管牙齿后牙根及桩核的应力情况。结果1.利用纤维桩修复正常形态根管牙齿的抗疲劳性能优于漏斗状根管,牙齿最初发生疲劳损伤的位置与最大主应力位置相同,疲劳安全系数临界线与修复后牙齿的横折线重合,在最大应变下载荷的垂线延伸线与修复后牙齿的斜折线重合。2.对于正常形态根管,3D打印个性化桩核系统的桩应力分布优于预成纤维桩系统,能够有效降低粘合剂的失效概率;对于漏斗形态根管,3D打印个性化桩核系统修复后牙根应力分布明显优于预成纤维桩系统,能够有效提高牙齿的抗折性。结论1.利用纤维桩修复正常形态根管牙齿的使用寿命高于漏斗形根管;纤维桩修复牙齿的最大主应力所在区域即为牙齿疲劳易损伤区域;纤维桩修复牙齿的疲劳失效是疲劳结构性破坏和疲劳裂纹扩展的综合结果,横折和斜折的发生概率在不同使用情况下也不相同。2.无论正常形态根管还是漏斗型根管,3D打印个性化桩核对牙体的修复效果均优于预成桩核系统。
[Abstract]:Objective to analyze the dynamics and fatigue failure mechanism of maxillary canines repaired with fiber post in normal morphology and funnel root canal by three-dimensional finite element analysis, and to reveal the mechanism of fatigue failure in the process of restoration. It provides a theoretical basis for the prediction of tooth life and the improvement of fatigue resistance after fiber post repair. On this basis, 3D printing technology was used to customize the stress distribution of each part of teeth after root canal post and core crown restoration, which provided a theoretical basis for its clinical application. Method 1. Based on the coordinate measuring machine, the point cloud data of the tooth model are obtained by scanning the tooth model. The point cloud data are reconstructed by using the reverse engineering software Geomagic Studio, and then the three-dimensional model of the restoration body is established by the CAD module of the NX UG software. 2. The teeth with normal root canal and funnel root canal were repaired by preformed fiber post, and the stress-strain of the restored teeth was analyzed based on three-dimensional finite element method. Based on the SWT fatigue life analysis criterion, the fatigue life of the repaired teeth was predicted. 3D printed fiber post and preformed fiber post were used to repair the root canal teeth with normal root canal and funnel shape, respectively. based on the three-dimensional finite element method, the stress of the root and post core of the two systems were analyzed and compared. Result 1. The fatigue resistance of normal root canal teeth repaired with fiber post is better than that of funnel root canal. the position of initial fatigue damage of teeth is the same as that of maximum principal stress, and the critical line of fatigue safety factor coincides with the transverse line of teeth after restoration. The vertical extension line of the load at the maximum strain coincides with the oblique line of the repaired tooth. 2. For the normal root canal, the stress distribution of 3D printing personalized post-core system is better than that of pre-fiber pile system, which can effectively reduce the failure probability of adhesive. For funnel root canals, 3D printing personalized post-core system is superior to prefibrillated post system in root stress distribution, which can effectively improve the bending resistance of teeth. Conclusion 1. The service life of using fiber post to repair normal root canal teeth is longer than that of funnel root canal, and the area where the maximum principal stress of fiber post is used to repair teeth is the area of fatigue and injury of teeth, and the service life of root canal teeth with fiber post is higher than that of funnel root canal. The fatigue failure of fiber post in tooth repair is the comprehensive result of fatigue structural failure and fatigue crack propagation, and the occurrence probability of transverse fracture and oblique fracture is different under different conditions. 2. Whether the normal root canal or funnel root canal, the effect of 3D printing personalized post and core on tooth restoration is better than that of pre-formed post and core system.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R783.3
[Abstract]:Objective to analyze the dynamics and fatigue failure mechanism of maxillary canines repaired with fiber post in normal morphology and funnel root canal by three-dimensional finite element analysis, and to reveal the mechanism of fatigue failure in the process of restoration. It provides a theoretical basis for the prediction of tooth life and the improvement of fatigue resistance after fiber post repair. On this basis, 3D printing technology was used to customize the stress distribution of each part of teeth after root canal post and core crown restoration, which provided a theoretical basis for its clinical application. Method 1. Based on the coordinate measuring machine, the point cloud data of the tooth model are obtained by scanning the tooth model. The point cloud data are reconstructed by using the reverse engineering software Geomagic Studio, and then the three-dimensional model of the restoration body is established by the CAD module of the NX UG software. 2. The teeth with normal root canal and funnel root canal were repaired by preformed fiber post, and the stress-strain of the restored teeth was analyzed based on three-dimensional finite element method. Based on the SWT fatigue life analysis criterion, the fatigue life of the repaired teeth was predicted. 3D printed fiber post and preformed fiber post were used to repair the root canal teeth with normal root canal and funnel shape, respectively. based on the three-dimensional finite element method, the stress of the root and post core of the two systems were analyzed and compared. Result 1. The fatigue resistance of normal root canal teeth repaired with fiber post is better than that of funnel root canal. the position of initial fatigue damage of teeth is the same as that of maximum principal stress, and the critical line of fatigue safety factor coincides with the transverse line of teeth after restoration. The vertical extension line of the load at the maximum strain coincides with the oblique line of the repaired tooth. 2. For the normal root canal, the stress distribution of 3D printing personalized post-core system is better than that of pre-fiber pile system, which can effectively reduce the failure probability of adhesive. For funnel root canals, 3D printing personalized post-core system is superior to prefibrillated post system in root stress distribution, which can effectively improve the bending resistance of teeth. Conclusion 1. The service life of using fiber post to repair normal root canal teeth is longer than that of funnel root canal, and the area where the maximum principal stress of fiber post is used to repair teeth is the area of fatigue and injury of teeth, and the service life of root canal teeth with fiber post is higher than that of funnel root canal. The fatigue failure of fiber post in tooth repair is the comprehensive result of fatigue structural failure and fatigue crack propagation, and the occurrence probability of transverse fracture and oblique fracture is different under different conditions. 2. Whether the normal root canal or funnel root canal, the effect of 3D printing personalized post and core on tooth restoration is better than that of pre-formed post and core system.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R783.3
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相关期刊论文 前10条
1 宋颖;唐雷;吴补领;李鉴轶;王文昊;徐楚;白宇哲;易思;徐迪威;;构建3D打印牙齿模型及其形态仿真性研究[J];中国临床解剖学杂志;2016年03期
2 刘菁_g;日孜瓦古力·阿木提;黄庆丰;;2种形态纤维桩修复前磨牙残冠的效果评价[J];上海口腔医学;2016年02期
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