边缘设计和负载条件对内冠应力分布的影响:有限元分析
Baijin Zeng1, Bin Luo1, Jiangqi Hu1
1Department of Prosthodontics, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, No. 4 Tiantanxili, Dongcheng District, Beijing, 100050, China.
BMC oral health
|June 5, 2024
概括
内冠边缘的设计会影响应力分布. 肩膀设计,特别是135度类型,可以减少牙科修复中的压力度,改善机械特性和生存率.
科学领域:
- 牙科材料科学 牙科材料科学
- 生物材料工程 生物材料工程
- 牙医学的有限元分析.
背景情况:
- 内冠是用于后牙的间接修复.
- 边缘设计和加载条件显著影响内冠机械性能和寿命.
- 了解压力分布对于优化内冠临床应用至关重要.
研究的目的:
- 分析和比较不同边缘设计 (关节,90°肩膀,135°肩膀) 的内冠中的应力分布.
- 评估各种静态负荷条件对内冠和周围牙结构中的应力模式的影响.
主要方法:
- 对于具有关节 (E0),90°肩部 (E90) 和135°肩部 (E135) 边缘设计的内冠,创建了三维有限元素分析 (FEA) 模型.
- 模型模拟了对牙和修复材料的均,同otropic 线性弹性特性.
- 应用了9个总计225N的静态负荷场景来评估·米塞斯应力和分布.
主要成果:
- 内冠应力与口腔负荷相似 (E0=E90=E135),但与E90/E135.5相比,在E0的语言负荷较低.
- 在所有负荷下,E0对乳的应力最高,E90和E135下降.
- 肩膀设计 (E90,E135) 显示压力集中在肩膀边缘,而E0则有更高的面膜压力.
结论:
- 虽然总体应力分布在设计中是可比的,但肩边缘,特别是135度类型,有效地降低了应力度.
- 这表明,具有肩边缘设计的内冠有可能提高机械稳定性和生存.
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