Relationship between static chemical and cyclic mechanical fatigue in a feldspathic porcelain.
Relationship between static chemical and cyclic mechanical fatigue in a feldspathic porcelain.
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DOI：
10.1016/s0109-5641(97)80019-x
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发表时间：
1997-03
期刊：
影响因子：
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通讯作者：
S. White;Zhen C. Li;Zhaokun Yu;V. Kipnis
中科院分区：
文献类型：
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作者：
S. White;Zhen C. Li;Zhaokun Yu;V. Kipnis
ObjectivesThe本研究的目的是确定是否静态化学和循环机械疲劳是独立的，或者如果它们相互作用，产生大于添加剂的强度损失在一个pastapathic porcelain.MethodsA钝识别技术被用来调查的pastapathic牙科瓷的循环机械疲劳和静态化学疲劳的反应。所有试样均在干燥惰性环境中制造，然后通过循环载荷进行机械疲劳，并在干燥惰性含氮、环境或潮湿环境中进行强度测试。进行了一系列试验，以评价化学疲劳和机械疲劳及其相互作用对强度损失的影响，确定循环疲劳环境和强度试验环境因素对强度的影响和相互作用，确定强度试验期间的环境类型是否影响试样强度，确定循环疲劳环境和强度试验环境对强度的影响。以及区分单独暴露于湿气引起的化学损伤和强度测试环境引起的应力腐蚀损伤，使用一对双向方差分析，单因素方差分析和t检验（p < 0.05）。结果这些实验表明，静态化学疲劳和循环机械疲劳都显着降低试样的强度，但它们没有相互作用，产生大于总和的影响。还了解到，在初次暴露于水分时未检测到化学疲劳，在机械疲劳循环过程中发生了小程度的化学疲劳，并且主要发生在强度测试期间，通过应力腐蚀现象。显微照片直观地评价了机械和化学疲劳对表面接触damage.SignificanceAs静态化学和循环机械疲劳影响瓷强度的影响，他们都应该被考虑在未来的评价。然而，由于它们在很大程度上是独立行动的，因此可以单独研究。
ObjectivesThe goal of this study was to determine if static chemical and cyclic mechanical fatigue are independent, or if they interact to produce greater than additive strength loss in a feldspathic porcelain.MethodsA blunt identification technique was used to investigate the response of a feldspathic dental porcelain to cyclic mechanical fatigue and static chemical fatigue. All specimens were fabricated in a dry inert environment and then mechanically fatigued by cyclic loading and strength-tested in dry inert nitrogenous, ambient or wet environments. A series of experiments were performed to evaluate the effects of chemical and mechanical fatigue, and their interaction on strength loss; to determine the effects of, and interaction between, the factors of cyclic fatigue environmental and strength test environment on strength; to ascertain if the type of environment during strength testing influenced specimen strength; and to distinguish between chemical damage caused by exposure to moisture alone and stress corrosion damage resulting from the strength testing environment, using a pair of two-way analysis of variance, a single one-way analysis of variance and a t-test (p < 0.05).ResultsThese experiments indicated that both static chemical fatigue and cyclic mechanical fatigue significantly reduced specimen strength, but they did not interact to produce greater than summative effects. It was also learned that chemical fatigue was not detected on initial exposure to moisture and that it occurred to a small extent during mechanical fatigue cycling, and primarily occurred during strength testing through a stress-corrosion phenomenon. Micrographs visually evaluated the effects of mechanical and chemical fatigue on surface contact damage.SignificanceAs both static chemical and cyclic mechanical fatigue influenced porcelain strength, they should both be considered in future evaluations. However, because they largely acted independently, they can be studied separately.