Interfacial Fatigue Damage in Onlay Ceramic Restorations

高嵌体陶瓷修复体中的界面疲劳损伤

• 批准号: 6808772
• 负责人: NORIKO KATSUBE
• 金额: $ 17.19万
• 依托单位: OHIO STATE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-15 至 2006-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6808772
• 关键词: biomaterial evaluation; biomaterial interface interaction; ceramics; computer simulation; dental material wear; dentin; elasticity; fiber optic microscopy; mechanical stress; model design /development; oral facial restoration; oral facial restoration material; physical model; resin; scanning electron microscopy; surface property

DESCRIPTION: Currently there exists no laboratory methodology that can predict the clinical performance of Dental restorations. The long-range goal of this work is to develop models and improved diagnostic tools that can be used to predict the relative clinical life of resin retained ceramic restorations. In this work we posit that interface degradation between the restoration and remaining tooth contributes to ceramic fracture and thus clinical longevity. The proposed plan is designed to test the hypothesis by combining the use of a simple but unique physical fatigue model with fractographic methods, a novel nondestructive evaluation technique, and fracture mechanics based computer modeling. The application lays out a systematic engineering based approach to study this problem. The objective of Aim 1 is to experimentally test our hypothesis. The model we have proposed is unique in that it allows the simulated restoration to be subjected to cyclic loading in a manner that consistently initiates failures from the interface without the accumulation of surface contact damage. Mechanical and environmental fatigue factors will be considered. Microtensile and fractographic methods will be utilized to examine the extent of the interface degradation resulting from fatigue conditions and determine the validity of our hypothesis. In Aim 2 we plan to evaluate the potential use of adjunct non-destructive tests to evaluate our proposed hypothesis. State-of-the-art non-destructive ultrasound technology will be applied to the evaluation of the interface and compared with microtensile and fractographic data obtained in Aim 1. The non-destructive technique, if proven successful, has significant potential for future development as a clinical diagnostic tool. In Aim 2 we also plan to apply fracture mechanics based computer models to investigate the influence of interracial degradation on the structural integrity of all-ceramic restorations. Although the proposed model is simple it will provide the foundation for future development of more complex models as fatigue-life predictive tools. Completion of the proposed work should provide basic understanding of the process by which fatigue failure of ceramic restoration occurs and a clearer understanding of the true potential of the experimental and analytical approaches.

描述：目前尚无实验室方法可以预测牙齿修复体的临床表现。这项工作的长期目标是开发模型和改进的诊断工具，可用于预测树脂保留陶瓷修复体的相对临床寿命。在这项工作中，我们假设修复体和剩余牙齿之间的界面退化会导致陶瓷断裂，从而延长临床寿命。所提出的计划旨在通过将简单但独特的物理疲劳模型与断裂方法、一种新颖的无损评估技术和基于断裂力学的计算机建模相结合来检验该假设。该应用程序提出了一种基于系统工程的方法来研究这个问题。 目标 1 的目标是通过实验检验我们的假设。我们提出的模型的独特之处在于，它允许模拟修复体以一种持续从界面引发失效的方式承受循环载荷，而不会累积表面接触损伤。将考虑机械和环境疲劳因素。将利用微拉伸和断裂分析方法来检查疲劳条件导致的界面退化程度，并确定我们假设的有效性。 在目标 2 中，我们计划评估辅助无损测试的潜在用途，以评估我们提出的假设。最先进的无损超声技术将应用于界面评估，并与目标 1 中获得的微拉伸和断口数据进行比较。如果证明成功，无损技术将具有巨大的未来发展潜力，因为临床诊断工具。在目标 2 中，我们还计划应用基于断裂力学的计算机模型来研究异族退化对全瓷修复体结构完整性的影响。尽管所提出的模型很简单，但它将为未来开发更复杂的模型作为疲劳寿命预测工具奠定基础。 完成拟议的工作应该提供对陶瓷修复体疲劳失效发生过程的基本了解，并更清楚地了解实验和分析方法的真正潜力。