Fracture Characteristics of Dental Materials

牙科材料的断裂特性

• 批准号: 7006985
• 负责人: James Drummond
• 金额: $ 42.89万
• 依托单位: UNIVERSITY OF ILLINOIS AT CHICAGO
• 依托单位国家: 美国
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-30 至 2008-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7006985
• 关键词: aging; biomaterial evaluation; biomaterial interface interaction; biomechanics; chemical models; clinical research; composite resins; dental material wear; dental materials; dental stress analysis; gas chromatography; glass; human tissue; mass spectrometry; mechanical stress; microdialysis; saliva; scanning electron microscopy; tooth; transmission electron microscopy

DESCRIPTION: The intent of this grant continuation is to focus on investigating the interface between the resin matrix and the glass filler. X-ray tomography will be used to obtain two-dimensional crack fronts of Dental composite and through image analysis construct three-dimensional representations of the crack surface interface. Also investigated will be the effect of aging in artificial saliva with and without enzymes on the leaching of ions from the glass filler. This will be accomplished using transmission electron microscopy (TEM) with microanalysis. Modeling the micro level stresses and strains in Dental composites will be used to predict the material properties of Dental composites, e.g., fracture toughness, at the macroscopic level. In addition, effects such as environmental loading (in this case artificial saliva and salivary enzymes) and aging (thermal and load cycling) can be modeled at the microscopic level to predict failure patterns of Dental composites under various loading conditions. Finally, a simple chemical model will be prepared and tested by mass spectrometry (MS) to represent the silane coupling agent and its attachment to the resin matrix and the glass filler. This model will also use MS to examine the chemical effect of aging in artificial saliva with and without enzymes. These three Aims are interrelated in that the silane bonding model will be used to help model the microstructure, the ion leaching will be utilized in the micro and chemical model, and the three dimensional crack tomography will be used to validate both models. The Specific Aims of this grant continuation are: 1) To determine the three-dimensional crack path of Dental composites and human teeth using tomography at the Advanced Photon Source at Argonne National Laboratory and to determine the inorganic leached components from the glass fillers using TEM microanalysis; 2) To model microstructural damage and failure of Dental composites; and 3) To correlate the degradation of resin-silane-bonds in Dental composite materials to their fracture during aging.

描述：此赠款延续的目的是专注于研究树脂矩阵和玻璃填充剂之间的接口。 X射线断层扫描将用于获得牙科复合材料的二维裂纹前沿，并通过图像分析构造裂纹表面界面的三维表示。还研究的还将是具有和没有酶的人造唾液中衰老对从玻璃填充物浸出的衰老的作用。这将使用微分析的透射电子显微镜（TEM）来完成。对牙科复合材料中的微应力和菌株进行建模将用于预测牙科复合材料的材料特性，例如在宏观上，骨折韧性。此外，可以在微观水平上建模诸如环境负荷（人造唾液和唾液酶）和衰老（热和负载循环）之类的效果，以预测各种负载条件下牙科复合材料的故障模式。最后，将通过质谱法（MS）制备简单的化学模型，以表示硅烷耦合剂及其在树脂基质和玻璃填充剂上的附着。该模型还将使用MS检查有或没有酶的人造唾液中衰老的化学作用。这三个目标是相互关联的，因为硅烷键模模型将用于帮助模拟微观结构，离子浸出将在微型和化学模型中使用，并且三维裂纹层析成像将用于验证这两个模型。该赠款延续的具体目的是：1）在Argonne National Laboratory的高级光子源中使用层析成像确定牙科复合材料和人牙的三维裂纹路径，并使用TEM微分析确定玻璃填充物中的无机浸出成分； 2）建模牙科复合材料的微观结构损伤和故障； 3）将树脂 - 硅烷键在牙齿复合材料中的降解与衰老过程中的断裂相关。