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

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Abstract

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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Data Availability

Data used to support the findings of this study are available from the corresponding author under at a reasonable request.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 52305326), and the Zhejiang Provincial Natural Science Foundation of China (No. LQ23E050016).

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Authors and Affiliations

  1. Mechanical and Electrical Engineering Institute, Ningbo Polytechnic, Ningbo, 315800, China

    Liang-wei Xu

  2. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310023, China

    Kang-jie Cheng

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Contributions

LX: Conceptualization, Methodology, Software, Writing - original draft preparation, Visualization. KC: Conceptualization, Investigation, Validation, Writing - review & editing, supervision.

Corresponding author

Correspondence to Kang-jie Cheng.

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Ethical Approval

The protocol for this study was approved by the Ethics Committee of Zhejiang Provincial People’s Hospital (No. QT2022093).

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Written informed consent was obtained from the parents.

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The authors declare that they have no conflict of interest related to the present work.

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Xu, Lw., Cheng, Kj. Effect of Thread Design Parameters on Central Screw Loosening: A 3D Finite Element Analysis. J. Med. Biol. Eng. (2024). https://doi.org/10.1007/s40846-024-00880-w

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