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首页> 外文期刊>The Journal of Prosthetic Dentistry >Stress analysis of effects of nonrigid connectors on fixed partial dentures with pier abutments.
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Stress analysis of effects of nonrigid connectors on fixed partial dentures with pier abutments.

机译：非刚性连接器对带有墩台的固定局部义齿的影响的应力分析。

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STATEMENT OF PROBLEM: In some patients, the pattern of missing teeth may require the use of a fixed partial denture (FPD) with an intermediate pier abutment. Information is needed regarding the biomechanical behavior and the position of a nonrigid connector for this treatment option. PURPOSE: The purpose of this study was to evaluate, by means of finite element method (FEM), the effects of rigid and nonrigid design types on stress distribution for 5-unit FPDs with pier abutments. MATERIAL AND METHODS: A 3-dimensional cross-section FEM model (SAP 2000) simulating a 5-unit metal ceramic FPD with a pier abutment with rigid or nonrigid designs (connector location at the mesial region of the second molar, at the distal region of the second premolar, at the mesial region of the second premolar, and at the distal region of the canine) was developed. In the model, the canine, second premolar, and second molar served as abutments. A supporting periodontal ligament and alveolar bone (cortical and trabecular) were modeled. A 50-N static vertical occlusal load was applied on the cusp of each abutment to calculate the stress distributions. Three different types of load were evaluated: loading of all cusps to simulate maximum centric occlusion contacts, loading of the canine to simulate a single anterior contact, and loading of the second molar to simulate a posterior contact. RESULTS: The analysis of the von Mises stress values revealed that maximum stress concentrations were located at the load areas for all models. Also, for all models, the highest stress values were located at connectors and cervical regions of abutment teeth, especially at the pier abutment. CONCLUSIONS: The area of maximum stress concentration at the pier abutment was decreased by the use of a nonrigid connector at the distal region of the second premolar.
机译：问题陈述：在某些患者中，牙齿缺失的模式可能需要使用带有中间桥墩基台的固定局部义齿（FPD）。需要有关此处理选项的生物力学行为和非刚性连接器位置的信息。目的：本研究的目的是通过有限元方法（FEM）评估刚性和非刚性设计类型对带有桥墩的5单元FPD应力分布的影响。材料和方法：3维横截面有限元模型（SAP 2000），模拟具有刚性或非刚性设计的桥墩基台的5单元金属陶瓷FPD（连接器位置在第二磨牙的近端区域，远端区域）在第二前磨牙的近中部区域和犬的远端区域形成了第二前磨牙的“牙齿”。在模型中，犬牙，第二前磨牙和第二磨牙用作基台。对支持牙周膜和牙槽骨（皮质和小梁）建模。在每个基台的尖端施加50 N的静态垂直咬合载荷，以计算应力分布。评估了三种不同类型的载荷：所有尖端的载荷以模拟最大的中心咬合接触;犬齿的载荷以模拟单个前部接触;第二磨牙的载荷以模拟后部接触。结果：对冯·米塞斯应力值的分析表明，所有模型的最大应力集中位于载荷区域。同样，对于所有模型，最高应力值位于基台牙齿的连接器和子宫颈区域，尤其是墩台。结论：通过在第二前磨牙的远端区域使用非刚性连接器，减少了墩台最大应力集中的面积。

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