螺纹设计参数对中心螺丝松动的影响:三维有限元分析

IF 1.6 4区 医学 Q4 ENGINEERING, BIOMEDICAL
Liang-wei Xu, Kang-jie Cheng
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引用次数: 0

摘要

方法 以商业种植体系统为原型,通过两个不同参数值的组合,即三种螺纹形状(三角形、对接形和反对接形)和三种螺纹间距(0.2 毫米、0.3 毫米和 0.4 毫米),创建了九个中心螺纹模型和与之匹配的种植体组件。这些模型被插入骨块中。在对每个中心螺丝施加预紧扭矩后,向基台施加倾斜 45 度的 100 N 负荷以模拟咬合负荷。通过 FE 软件评估了中心螺丝的稳定性能。结果 对于中心螺丝的形状,最高应力总是位于第一螺纹处,而反向对接组的最高应力总是位于第二螺纹处。三角螺纹(平均 650 兆帕)和反向对接螺纹(平均 729 兆帕)比对接螺纹(平均 920 兆帕)更有利于降低中心螺纹应力。结论螺纹形状轮廓和螺纹螺距对中心螺杆的稳定性能有显著影响。螺纹形状为三角形、螺距为 0.2 毫米的中心螺丝具有最佳的机械性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Thread Design Parameters on Central Screw Loosening: A 3D Finite Element Analysis

Effect of Thread Design Parameters on Central Screw Loosening: A 3D Finite Element Analysis

Purpose

The objective of this study was to evaluate the effect of thread shape outline, thread pitch and preload on the central screw loosening or fracturing by using 3D finite element (FE) method.

Methods

By using a commercial implant system as prototypes, nine central screw models and matching implant components were created by combinations of two parameters with different values: three screw shapes (triangle, buttress and reverse buttress) and three screw pitches (0.2 mm, 0.3 mm and 0.4 mm). These models were inserted into a bone block. After applying pre-tightening torque to each central screw, a 100 N load tilted at 45 degrees was applied to the abutment to simulate an occlusal load. The stability performance of the central screws was evaluated through FE software.

Results

For the central screw shape, the highest stress was always located at the level of the first thread, while the highest stress of the reverse buttress group was always located at the level of the second thread. Triangle (average 650 MPa) and reverse buttress (average 729 MPa) threads were more conducive to reducing central screw stress than buttress thread (average 920 MPa). Moreover, it is necessary to avoid thread parameters design with buttress shape/0.3 mm pitch and buttress shape/0.4 mm pitch.

Conclusion

Thread shape outline and thread pitch significantly influenced central screw stability performance. The central screw with a triangle thread shape and a pitch of 0.2 mm presented the best mechanical properties.

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来源期刊
CiteScore
4.30
自引率
5.00%
发文量
81
审稿时长
3 months
期刊介绍: The purpose of Journal of Medical and Biological Engineering, JMBE, is committed to encouraging and providing the standard of biomedical engineering. The journal is devoted to publishing papers related to clinical engineering, biomedical signals, medical imaging, bio-informatics, tissue engineering, and so on. Other than the above articles, any contributions regarding hot issues and technological developments that help reach the purpose are also included.
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