RESTORATIVE MATERIAL WEAR FACTORS

这项研究的长期目标是开发一种预测性的 牙科修复材料磨损模型。在此应用程序中， 后方复合修复材料的疲劳/磨损 调查过了。成功实现项目目标可使 新型修复体材料的体外设计与评价 需要长时间的临床试验。这应该允许更快的 向公众介绍更有效和更具成本效益的材料。 将检验以下无效假设：a.治愈程度 和溶剂吸附不影响聚合物基质的疲劳/磨损 B.从销盘的寿命预测/参数 疲劳/磨损研究与通过剪切获得的研究不同， 弯曲和压痕模式疲劳试验；C.表面形态 磨损和疲劳表面的磨损与磨损机制无关。 这些具体目标旨在帮助检验这些假说： 1.为了获得、聚合到两种不同程度的固化，以及 根据玻璃化转变行为表征一种复合材料 专有牙科修复材料的代表材料； 材料也将被浸泡在水/乙醇溶液中以模拟 暴露在口服液中。2.为了获得剪切、弯曲、 和压痕模式，并推导出这些模式的寿命参数 实验。3.使用钉在盘上的技术来产生疲劳 在复合样品中的磨损，并将这些结果与特定的 目标2，以及有限元分析。4.发展完善 静态压痕、动态压痕和裂纹的有限元模型 颗粒增强复合材料中的传播。5.聘用 用于表征疲劳/磨损表面的形貌测量技术。

The long-term objective of this study is the development of a predictive model for the wear of dental restorative materials. In this application, the fatigue/wear of posterior composite restorative materials is to be investigated. Successful attainment of the project objectives could allow in vitro design and evaluation of new restorative materials without the need for lengthy clinical trials. This should permit the speedier introduction of more effective and cost-efficient materials to the public. The following null hypotheses are to be tested: A. that degree of cure and solvent sorption do not affect the fatigue/wear of a polymer matrix composite; B. that the lifetime predicting/parameters from pin-on-disc fatigue/wear studies are dissimilar from those obtained from shear, bending, and indentation mode fatigue tests; C. that surface morphology of worn and fatigued surfaces is unrelated to wear mechanisms. These specific aims have been designed to aid in testing these hypotheses: 1. To obtain, polymerize to two different degrees of cure, and characterize with respect to glass transition behavior a composite material representative of proprietary dental restorative materials; the material will also be soaked in a water/ethanol solution to simulate exposure to oral fluids. 2. To obtain fatigue data in shear, bending, and indentation modes, and derive the lifetime parameters for these experiments. 3. To employ the pin-on-disc technique to generate fatigue wear in composite samples, and relate these results to those from specific aim 2, as well as to finite element analyses. 4. To develop and refine finite element models of static and dynamic indentation, and crack propagation in particulate reinforced composite materials. 5. To employ morphometric techniques to characterize fatigue/wear surfaces.