A Comparison of Abutment Screw Loosening in 24-Degree Angulation-Correcting and Straight Implants: An In Vitro Study.

IF 2.1 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE International Journal of Prosthodontics Pub Date : 2024-08-23 DOI:10.11607/ijp.8463

Jane Pellew, James Dudley

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Abstract

Purpose: To compare abutment screw loosening in 24-degree angulation-correcting and straight implants subjected to nonaxial cyclic loading.

Materials and methods: Seven external connection 24-degree angulation-correcting implants (AI) and seven external connection straight implants (SI) were embedded in acrylic resin within a brass housing. A hemispherical titanium fatigue abutment was secured to each implant using a titanium abutment screw tightened to 32 Ncm. Each implant-abutment complex was positioned within a tooth wear machine and subjected to 1,000,000 cycles of 50-Ncm nonaxial loading to simulate 1 year of function. The abutment screw removal torque values were measured before and after cyclic loading, and the differences were statistically analyzed using two-way ANOVA and post hoc pairwise Dunn tests. Scanning electron microscopy and finite element analyses were performed to assess the wear of the abutment screws.

Results: The mean torque loss for the AI group was 21.44% (P < .001) compared to 24.56% (P < .001) for the SI group. There was a statistically significant difference between the AI and SI groups (P = .006).

Conclusions: Both groups exhibited significant abutment screw loosening. Within the limitations of this study, 24-degree angulation-correcting implants resisted screw loosening significantly more than straight implants.

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24 度角校正种植体与直种植体基台螺钉松动的比较：体外研究

目的：比较24度角校正种植体和直种植体在非轴向循环负荷下的基台螺丝松动情况：在黄铜外壳内将七个外部连接的 24 度角校正种植体（AI）和七个外部连接的直种植体（SI）嵌入丙烯酸树脂中。使用钛基台螺丝将半球形钛疲劳基台固定在每个种植体上，并将其拧紧至 32 Ncm。将每个种植体和基台复合体放置在牙齿磨损机中，并承受 1,000,000 次 50 牛顿/厘米的非轴向加载，以模拟 1 年的功能。对循环加载前后的基台螺丝拆卸扭矩值进行了测量，并使用双向方差分析和事后配对 Dunn 检验对差异进行了统计分析。扫描电子显微镜和有限元分析评估了基台螺钉的磨损情况：AI组的平均扭矩损失为21.44%（P < .001），而SI组为24.56%（P < .001）。AI组和SI组之间的差异具有统计学意义（P =；.006）：结论：两组都有明显的基台螺丝松动。在本研究的限制条件下，24 度角校正种植体的抗螺钉松动能力明显高于直种植体。

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

International Journal of Prosthodontics 医学-牙科与口腔外科

CiteScore

3.20

自引率

4.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Official Journal of the European Association for Osseointegration (EAO), the International College of Prosthodontists (ICP), the German Society of Prosthodontics and Dental Materials Science (DGPro), and the Italian Academy of Prosthetic Dentistry (AIOP) Prosthodontics demands a clinical research emphasis on patient- and dentist-mediated concerns in the management of oral rehabilitation needs. It is about making and implementing the best clinical decisions to enhance patients'' quality of life via applied biologic architecture - a role that far exceeds that of traditional prosthetic dentistry, with its emphasis on materials and techniques. The International Journal of Prosthodontics is dedicated to exploring and developing this conceptual shift in the role of today''s prosthodontist, clinician, and educator alike. The editorial board is composed of a distinguished team of leading international scholars.