天然牙—种植体双端桥基牙骨支持组织应力的动力学分析

发布时间：2018-05-05 00:07

本文选题：天然牙 + 种植体　；参考：《暨南大学》2014年硕士论文

【摘要】：目的建立天然牙-种植体联合支持式双端固定桥及其支持组织的三维有限元模型，在动态载荷下分析桥基牙周围骨支持组织表面的应力大小和应力分布规律，为临床天然牙-种植体联合支持式双端固定桥的应用提供生物力学参考依据。方法应用CT扫描技术与Soliworks、AutoCAD、Ansys软件相结合，，建立左下颌后牙联合支持式双端固定桥（35为天然牙，36为桥体，37为种植体）及其支持组织的三维有限元模型，分别在一个咀嚼周期和三个咀嚼周期内对模型进行连续动态加载，观察固定桥修复前后基牙周围骨支持组织表面的应力大小和应力分布规律。结果 1、应用CT扫描技术与AutoCAD、Soliworks、Ansys软件相结合能够较为精确地建立左下颌天然牙-种植体联合支持式双端固定桥及其支持组织的三维有限元模型。 2、修复前后，骨支持组织应力大小受加载方向和加载时间的影响，应力峰值出现在斜向加载期末；修复前后种植体骨支持组织应力值均大于天然牙，种植体骨支持组织最大Von mises应力值为141.773Mpa，天然牙为63.179Mpa，两基牙骨支持组织应力最大平均差值约为70Mpa。 3、修复前后两基牙应力集中均出现在颈部皮质骨内，两基牙颈部以下区域骨组织应力小且均匀；应力集中部位主要受加载方向影响，种植体以颈部近中及颊舌侧为主，天然牙以颈部颊舌侧为主。 4、卸载期末，两基牙存在残余应力；修复后天然牙残余应力均数范围为0.048～5.698Mpa，种植体残余应力范围为0.055～8.894Mpa。结论 1、两基牙颈部皮质骨出现高应力集中区，颈下区域为低应力区；加载条件为影响基牙骨支持组织的应力大小和分布的重要因素。 2、种植体骨支持组织应力大于天然牙，但应力释放速度较快；卸载期末，两基牙骨组织残余应力大小相近。 3、天然牙-种植体体联合支持式双端固定桥的修复设计可行。
[Abstract]:Purpose A three-dimensional finite element model of the natural dentist-implant supported double-end fixed bridge and its supporting tissue was established. The stress size and stress distribution on the surface of the bone supporting tissue around the abutment were analyzed under dynamic load. To provide biomechanical reference for clinical application of natural tooth-implant-supported double-end fixation bridge. Method A 3D finite element model of the left mandibular posterior teeth supported double end fixation bridge was established by using CT scanning technique and SoliworksSliwork AutoCADU Ansys software. The model was subjected to continuous dynamic loading during one masticatory period and three masticatory cycles respectively. The stress distribution and stress distribution on the surface of bone supporting tissue around abutment were observed before and after fixed bridge repair. Result 1. Using CT scanning technique and AutoCAD Soliworksl Ansys software, the 3D finite element model of the bilateral fixed bridge and its supporting tissue supported by natural teeth and implants in the left mandible can be established accurately. 2. Before and after restoration, the stress of bone support tissue was affected by the loading direction and loading time, and the stress peak appeared at the end of oblique loading, and the stress value of implant bone support tissue before and after restoration was higher than that of natural tooth. The maximum Von mises stress of implant bone support tissue was 141.773Mpa. and the natural tooth was 63.179Mpa. the maximum average difference between the two abutment bone supporting tissues was about 70Mpa. 3. The stress concentration of the two abutments appeared in the cortical bone of the neck before and after the restoration, the stress of the bone tissue in the region below the neck of the abutments was small and even, the stress concentration was mainly affected by the direction of loading, and the implant was mainly located in the proximal neck and the buccal tongue. The natural teeth are mainly the buccal and lingual side of the neck. (4) at the end of unloading, residual stress existed in the two abutments, the mean value of residual stress of natural teeth was 0.048 ~ 5.698Mpaand the range of residual stress of implants was 0.055 ~ 8.894Mpa. Conclusion 1. There was a high stress concentration area in the cortical bone of the two abutments and a low stress zone in the subcervical region, and the loading conditions were the important factors affecting the stress size and distribution of the abutment bone supporting tissue. 2. The stress of implant bone supporting tissue is higher than that of natural tooth, but the stress release rate is faster, and the residual stress of bone tissue of the two abutment teeth is similar at the end of unloading. 3. The restoration design of natural tooth-implant-supported two-end fixed bridge is feasible.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R783.6

【相似文献】