The Effects of Laboratory Contamination of Implant Abutment Screw and Connection on Reverse Torque Value – An In Vitro Study

IF 2.2 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Clinical and Experimental Dental Research Pub Date : 2025-09-16 DOI:10.1002/cre2.70222

Hamed Bahrami Maleki, Mona Bazooband, Parviz Amini

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引用次数: 0

Abstract

Objectives

This in vitro experimental study aimed to evaluate the effects of laboratory contamination of implant abutment screws and connection surfaces on reverse torque values (RTVs), as an indicator of screw preload loss.

Material and Methods

Forty-five Dentis One Q implants and 45 CCM UCLA abutments were randomly assigned into three groups (n = 15 per group). Group 1 (control) involved uncontaminated abutments and screws with no restorations. Group 2 (screw contamination) used new abutments attached with screws contaminated by laboratory materials (porcelain powder, metal debris, and polishing paste). Group 3 (connection contamination) included screw-retained restorations fabricated under contaminated conditions and attached using new screws. All samples were subjected to standardized torque (250 N·cm), thermocycling (1500 cycles between 5°C and 55°C), and subsequent RTV measurement. One-way ANOVA and Tukey's post hoc tests were used for statistical analysis (α = 0.05).

Results

Mean RTVs (SD) were 218 (0.15) N·cm (control), 181 (0.14) N·cm (screw contamination), and 207 (0.11) N·cm (connection contamination). RTVs in the screw contamination group were significantly lower than both the control (p < 0.001) and connection contamination groups (p < 0.001). The difference between the control and connection contamination groups was not statistically significant (p = 0.08).

Conclusions

Laboratory contamination of implant components can significantly reduce reverse torque values, particularly in cases of screw contamination, indicating an increased risk of screw loosening. Contamination control during prosthetic procedures is essential to maintaining implant stability.

Abstract Image

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实验室污染对种植基牙螺钉和连接体反扭矩值的影响-体外研究。

目的：本体外实验研究旨在评估实验室污染对反扭矩值（RTVs）的影响，作为螺钉预载荷损失的指标。材料与方法：将45个dental One Q种植体和45个CCM UCLA基牙随机分为3组，每组15个。组1（对照组）为未受污染的基台和螺钉，无修复体。第2组（螺钉污染）使用新基台，用实验室材料（瓷粉、金属碎片、抛光膏）污染的螺钉连接。组3（连接污染）包括在污染条件下制造的螺钉保留修复体，并使用新螺钉连接。所有样品都经过标准化扭矩（250 N·cm）、热循环（在5°C至55°C之间循环1500次）和随后的RTV测量。采用单因素方差分析和Tukey事后检验进行统计学分析（α = 0.05）。结果：平均rtv （SD）分别为218 (0.15)N·cm（对照）、181 (0.14)N·cm（螺钉污染）和207 (0.11)N·cm（连接污染）。螺钉污染组的rtv明显低于对照组(p)。结论：实验室污染的种植体组件可以显著降低反向扭矩值，特别是在螺钉污染的情况下，这表明螺钉松动的风险增加。假体过程中的污染控制对维持假体的稳定性至关重要。

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 and Experimental Dental Research DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

3.30

自引率

5.60%

发文量

165

审稿时长

26 weeks

期刊介绍： Clinical and Experimental Dental Research aims to provide open access peer-reviewed publications of high scientific quality representing original clinical, diagnostic or experimental work within all disciplines and fields of oral medicine and dentistry. The scope of Clinical and Experimental Dental Research comprises original research material on the anatomy, physiology and pathology of oro-facial, oro-pharyngeal and maxillofacial tissues, and functions and dysfunctions within the stomatognathic system, and the epidemiology, aetiology, prevention, diagnosis, prognosis and therapy of diseases and conditions that have an effect on the homeostasis of the mouth, jaws, and closely associated structures, as well as the healing and regeneration and the clinical aspects of replacement of hard and soft tissues with biomaterials, and the rehabilitation of stomatognathic functions. Studies that bring new knowledge on how to advance health on the individual or public health levels, including interactions between oral and general health and ill-health are welcome.