Is fatigue mechanism implicated in intraoral fracture of narrow dental implants? A thorough retrieval analysis of two failed implant fixtures retrieved from a single patient

IF 1.7 Q3 DENTISTRY, ORAL SURGERY & MEDICINE Saudi Dental Journal Pub Date : 2024-05-01 DOI:10.1016/j.sdentj.2024.02.006

Youssef S. Al Jabbari , Raymond Fournelle , Arif Sufyan , Spiros Zinelis

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Abstract

Purpose

This study aimed to perform a thorough failure analysis of two fractured narrow dental implants after medium-term in vivo use.

Materials and methods

The top parts of two fractured Narrow Dental Implant (NDI) fixtures were retrieved from two different locations at two different times from the same patient. The NDI-specimen-1 was 12-months in service while the NDI-specimen-2 was 17-months in service. In both cases, the top parts of the fractured NDI fixtures that were attached to prosthetic components were retrieved and subjected to thorough, non-destructive and destructive testing.

Results

Light Microscopy (LM) and Scanning Electron Microscopy (SEM) revealed that both the retrieved fractured NDIs failed because of fatigue, characterized by beach and ratchet marks. Macroscopic examination revealed that fatigue cracks initiated at the internal thread surfaces of the implants and propagated around them until final fracture. Both samples fractured near the end of the retaining screw and followed the root of the internal thread. Optical and SEM analyses revealed a uniform distribution of irregularly shaped grains (diameter = 2 to 5 μm). X -ray Energy Dispersive Spectroscopy (EDS) analysis showed that the NDI-specimen-1 was made using Ti-14%Zr with a Vickers Hardens (HV) of 288 ± 5.

Conclusion

Since the fracture occurred by a fatigue; thus, an increase in fatigue resistance will be beneficial for the longevity of NDI.

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窄口种植体口内骨折是否与疲劳机制有关？对从一名患者身上取回的两个失败种植体固定装置的彻底取回分析

材料和方法在同一患者的两个不同时间，从两个不同位置取回了两个断裂的窄牙种植体（Narrow Dental Implant，NDI）的顶部。NDI 样本-1 使用了 12 个月，而 NDI 样本-2 使用了 17 个月。结果光学显微镜（LM）和扫描电子显微镜（SEM）显示，取回的两个断裂的 NDI 都因疲劳而失效，其特征是有沙滩和棘轮痕迹。宏观检查显示，疲劳裂纹始于植入物的内螺纹表面，并在其周围扩展，直至最终断裂。两个样品都是在固定螺钉末端附近断裂，并沿着内螺纹根部断裂。光学和扫描电镜分析表明，不规则形状的晶粒（直径 = 2 至 5 μm）分布均匀。X 射线能量色散光谱（EDS）分析表明，NDI-试样-1 是用 Ti-14%Zr 制成的，维氏硬度（HV）为 288 ± 5。

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

Saudi Dental Journal DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

22 weeks

期刊介绍： Saudi Dental Journal is an English language, peer-reviewed scholarly publication in the area of dentistry. Saudi Dental Journal publishes original research and reviews on, but not limited to: • dental disease • clinical trials • dental equipment • new and experimental techniques • epidemiology and oral health • restorative dentistry • periodontology • endodontology • prosthodontics • paediatric dentistry • orthodontics and dental education Saudi Dental Journal is the official publication of the Saudi Dental Society and is published by King Saud University in collaboration with Elsevier and is edited by an international group of eminent researchers.