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Thin-Walled Hollow Shafts

Thin-Walled Hollow Shafts

In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...

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Updated: Sep 16, 2025

Intravital Longitudinal Imaging of Vascular Dynamics in the Calvarial Bone Marrow

Intravital Longitudinal Imaging of Vascular Dynamics in the Calvarial Bone Marrow

Published on: April 11, 2025

使用显式动力学有限元分析优化牙植入物的线程设计.

Qi Zhong^1,2,3,4, Zidi Zhai^1,2,3,4, Zi'ang Wu^1,2,3,4

¹Department of Prosthodontics, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, No. 639 Zhizaoju Road, Shanghai, 200011, China.

Scientific reports

|July 4, 2025

概括

优化牙植入物线设计可以减少周围骨的压力. 这种增强的设计促进了更好的骨生长和植入物稳定性,从而改善了骨质整合和临床结果.

关键词:

气囊骨骨头的骨牙植入物是一种牙植入物.显式动态有限元素分析.压力分布压力分布线程设计线程设计

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相关实验视频

Last Updated: Sep 16, 2025

Intravital Longitudinal Imaging of Vascular Dynamics in the Calvarial Bone Marrow

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Published on: April 11, 2025

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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
生物力学生物力学

背景情况:

优化牙植入物线设计对于植入周骨的应力分布至关重要.
目前的商业植入物设计可能无法提供理想的应力屏蔽或负载转移.
了解线程几何和骨反应之间的关系对于改善植入成功至关重要.

研究的目的:

为了优化商业牙植入物的线程设计,以实现植入周围骨中理想的应力分布.
为了评估优化线程设计对子骨模型骨整合的影响.

主要方法:

使用显式动态 (EDFEA) 的有限元分析 (FEA) 计算植入骨周围骨的动态·米塞斯应力 (σvM).
正角实验设计,以确定最佳线程参数 (距离,深度,尖端宽度,冠状/尖端表面角).
在体内研究子植入优化和原始设计,测量植入器稳定率 (ISQ),骨与植入器接触 (BIC) 和骨体积分数 (BV/TV).

主要成果:

优化的线程设计 (OPT-max和OPT-man) 分别确定了大和下后部区域.
优化的植入物在植入后4周显著改善了ISQ值 (p <0.05).
与原始设计相比,在OPT-man植入物周围观察到BIC和BV/TV-500的显著增加,在OPT-max植入物周围观察到BV/TV-500和BV/TV-1000的显著增加 (p <0.05).

结论:

牙植入物线设计在植入过程中和植入后立即显著影响植入周围骨的应力分布.
基于EDFEA的优化线程设计促进骨质生成并增强骨质整合.
这项研究为开发下一代牙科植入物提供了基础,这些植入物具有改善的生物力学特性和临床性能.