不同定制的支柱材料对不同内部植入物-支柱连接的应力分布的影响:有限元分析
1Department of Fixed Prosthodontics, Faculty of Dentistry, Benisuef University, Benisuef, Egypt.
BMC oral health
|November 22, 2025
概括
这项研究发现,虽然植入物连接类型表现出类似的压力模式,但斜负荷超过了皮层骨干应变的安全极限. 支柱为牙科植入物提供了最有利的应力分布.
科学领域:
- 生物材料科学 生物材料科学
- 生物力学 生物力学
- 牙科植入物学 牙科植入物学
背景情况:
- 关于植入物-支柱连接类型和支柱材料对生物力学负载转移的综合影响的研究有限.
- 了解这些相互作用对于改善植入物寿命和临床结果至关重要.
研究的目的:
- 用四种支柱材料 (,Co-Cr,软磨Co-Cr-Mo,) 调查两种内部植入物-支柱连接 (星形管内管和混合摩尔斯缩/内部六边形) 的生物机械行为.
- 用3D有限元素分析 (FEA) 分析植入物部件和周围骨在轴向和斜向负载下的应力和应变分布.
主要方法:
- 建模了两个3D内部植入物-接连接 (星形和混合).
- 模拟了四种支柱材料 (,Co-Cr,软磨Co-Cr-Mo,).
- 应用轴向 (200 N) 和斜 (100 N) 负荷到下第一个牙冠,并通过FEA分析压力/菌株.
主要成果:
- 这两种连接类型在轴负荷下表现出类似的应力模式;斜负荷产生更高的应力,特别是在混合 (Co-Cr) 模型中.
- 皮层骨经历了峰值应力和应变,斜负荷超过了应变的安全极限.
- 支柱始终表现出最低的应力值,而和Co-Cr材料的分布中等. 所有模型都表现出机械稳定性,螺丝变形最小.
结论:
- 星形连接和混合连接都是生物机械可行的,压力水平低于轴承负载下的合金收益强度.
- 斜负荷存在风险,因为它超过了安全的皮质应变极限.
- 支柱提供了最有利的生物力学特征,建议它们用于增强牙植入物的寿命.
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