Effect of Loading Angles on Abutment Screw Loosening: In Vitro Study

IF 3.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Clinical Implant Dentistry and Related Research Pub Date : 2024-12-03 DOI:10.1111/cid.13421

Fei Sun, Li-Bing Xu, Zeng Lin, Lu-Lu Jiang

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Abstract

Aim

Biomechanical performance is a critical factor in the long-term success of dental implants, with abutment screw loosening being a common clinical issue. This study aimed to examine the impact of abutment screw design and external load loading angles on abutment screw loosening.

Materials and Methods

Abutments and abutment screws with 30°, 60°, 90°, and 180° fitting tapers were fabricated and tested for preload and initial loosening torque. Subsequently, dynamic loosening tests were conducted at loading angles of 15°, 30°, and 45°. Finite element analysis (FEA) was used to calculate the stress and strain distribution of the abutment screws.

Results

The findings indicated that large-taper abutment screws exhibit a higher preload, whereas small-taper abutment screws demonstrate greater loosening torque values. Additionally, as the loading angle increases, the loosening torque value decreases, and the stress and strain values of the abutment screw increase.

Conclusions

Abutment screws with smaller taper heads exhibited superior resistance to loosening. Moreover, the anti-loosening performance of the abutment screws decreased with higher external load loading angles.

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加载角度对基牙螺钉松动影响的体外研究。

目的：生物力学性能是种植体长期成功的关键因素，基牙螺钉松动是一个常见的临床问题。本研究旨在探讨基台螺丝设计及外部荷载角度对基台螺丝松动的影响。材料和方法：制作30°、60°、90°和180°锥度的基台和基台螺钉，并测试预紧力和初始松动扭矩。随后，分别在加载角度为15°、30°和45°的情况下进行动态松动试验。采用有限元分析方法计算了基台螺钉的应力应变分布。结果：研究结果表明，大锥度基台螺钉具有较高的预紧力，而小锥度基台螺钉具有较大的松动力矩值。此外，随着加载角度的增大，松动力矩值减小，基台螺钉的应力应变值增大。结论：锥头较小的基牙螺钉具有较好的抗松动性。此外，随着外荷载加载角度的增大，台肩螺钉的抗松动性能下降。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Clinical Implant Dentistry and Related Research 医学-牙科与口腔外科

CiteScore

6.00

自引率

13.90%

发文量

103

审稿时长

4-8 weeks

期刊介绍： The goal of Clinical Implant Dentistry and Related Research is to advance the scientific and technical aspects relating to dental implants and related scientific subjects. Dissemination of new and evolving information related to dental implants and the related science is the primary goal of our journal. The range of topics covered by the journals will include but be not limited to: New scientific developments relating to bone Implant surfaces and their relationship to the surrounding tissues Computer aided implant designs Computer aided prosthetic designs Immediate implant loading Immediate implant placement Materials relating to bone induction and conduction New surgical methods relating to implant placement New materials and methods relating to implant restorations Methods for determining implant stability A primary focus of the journal is publication of evidenced based articles evaluating to new dental implants, techniques and multicenter studies evaluating these treatments. In addition basic science research relating to wound healing and osseointegration will be an important focus for the journal.