The effect of oral-like environment on dental implants' fatigue performance
The effect of oral-like environment on dental implants' fatigue performance
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DOI：
10.1111/clr.12084
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发表时间：
2014-02-01
影响因子：
4.3
通讯作者：
Machtei, Eli E.
中科院分区：
文献类型：
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作者：
Shemtov-Yona, Keren;Rittel, Daniel;Machtei, Eli E.
目的与目的本研究的目的是评估模拟口腔内液体环境对标准直径3.75 mm种植体疲劳性能的影响。口腔内放置的牙种植体在口腔环境中反复承受咀嚼负荷，这与室内空气标准实验室条件有很大不同。几项研究检查了口腔内断裂种植体的断裂面，发现腐蚀疲劳是主要的失效机制。然而，基于种植体材料在口腔内环境中相对耐腐蚀的前提下，种植体的疲劳性能基本上是在室内空气中研究的。材料与方法对32个3.75 mm钛合金植入物进行循环压缩载荷试验。在含氟250ppm的人工唾液替代品中进行测试。当种植体结构倒塌或完成5x10(6)次循环且无明显故障时，装载机停止运行。将载荷与循环次数的关系绘制为生物力学疲劳分析曲线（S-N曲线）。为人工唾液测试绘制的S-N曲线与之前在室内空气环境中测试的相同植入物获得的曲线进行比较。用扫描电子显微镜（SEM）进行失效分析。结果人工唾液的S-N曲线与室内空气的S-N曲线比较有较大差异。在人工唾液环境下获得的S-N曲线显示在535N ~ 800N之间存在有限寿命区。在465N以下存在过渡区，生存概率为50%，而在室内空气中，在810N - 620N之间存在过渡区，在620N以下存在无限生存区。结论环境条件对种植体的疲劳性能有不利影响。在评估牙种植体的机械性能时应考虑到这一事实。
Aim and ObjectivesThe aim of this study was to evaluate the influence of fluid environment mimicking intra-oral conditions on fatigue performance of standard diameter, 3.75-mm implants. Dental implants placed intra-orally are repeatedly submitted to mastication loads in the oral environment, which differ substantially from room-air standard laboratory conditions. Several studies that examined fracture surfaces of intra-orally fractured dental implants have identified corrosion fatigue as the main failure mechanism. Yet, fatigue performance of dental implants has been essentially studied in room air, based on the premise that the implant material is relatively resistant to corrosion in the intra-oral environment.Material and methodsThirty-two 3.75-mm titanium alloy implants were tested under cyclic compressive loading. The tests were performed in artificial saliva substitute containing 250ppm of fluoride. The loading machine stopped running when the implant structure collapsed or when it completed 5x10(6) cycles without apparent failure. The load vs. number of cycles was plotted as curve for biomechanical fatigue analysis (S-N curve). The S-N curve plotted for the artificial saliva test was compared to the curve obtained previously for the same implants tested in a room-air environment. Failure analysis was performed using scanning electron microscopy (SEM).ResultsA comparison of the S-N curves obtained in artificial saliva and in room air showed a considerable difference. The S-N curve obtained in the artificial saliva environment showed a finite life region between 535N and 800N. The transition region was found below 465N, with a probability of survival of 50%, while in room air, the transition region was between 810N and 620N and an infinite life region below 620N was identified.ConclusionsThe results of this study show that environmental conditions adversely affect implants' fatigue performance. This fact should be taken into account when evaluating the mechanical properties of dental implants.