有限元分析:连接器设计和固定部分牙植入物支持的金属框架的庞特应力分布
Saja Ali Muhsin1, Enas Kareem Mohammed2, Khalid Bander3
1Middle Technical University.
Journal of long-term effects of medical implants
|June 6, 2024
概括
连接器形状 (方形与圆形) 在植入式固定部分假牙 (FPD) 中极少影响应力和变形. 然而,与单个负载点相比,多重负载点显著增加了形变形.
科学领域:
- 生物材料工程 生物材料工程
- 牙科植入物学 牙科植入物学
- 有限元分析 有限元分析
背景情况:
- 牙植入物支持的固定部分假牙 (FPD) 对于牙置换至关重要.
- 了解桥梁和连接器设计的机械行为对于长期成功至关重要.
- 以前的研究还没有完全阐明不同连接器几何形状的比较应力和变形模式在无水泥植入物支持的FPD中.
研究的目的:
- 为了虚拟评估金属FPD杆的应力和变形.
- 为了比较方形和圆形连接器在各种负载条件下对形机械行为的影响.
- 评估有限元建模 (FEM) 在分析植入物支持的FPD的临床相关性.
主要方法:
- 创建了一个虚拟的3D模型的两个植入物支持的FPD与- (Co-Cr) 金属基底结构.
- 两种连接器设计 (方形和圆形) 已实施为pontic-to-implant-supported皇冠连接.
- 用有限元建模 (FEM) 模拟在不同的闭塞负载场景下应力和变形. 非参数的曼-惠特尼U测试用于统计分析.
主要成果:
- 在单个或多个负载点下,在方形和圆形连接器之间没有观察到应力或变形的显著差异 (P > 0.05).
- 在三点负荷和单点负荷之间发现了明显的变形差异 (P ≤0.05).
- 在相同的负载条件下,无论连接器的形状如何,Pontic封闭表面应力和变形都是可比的.
结论:
- 连接器几何形状 (正方形与圆形) 在这种无植入物支持的FPD模型中对杆的应力和变形的影响是微不足道的.
- 闭塞负荷的分布和大小显著影响着形变形,多重负荷点会导致更大的变形.
- FEM提供了有价值的虚拟数据,以了解植入式FPD的机械性能,帮助实验室和临床应用.
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