COMPOSITE MATERIAL DEGRADATION UNDER LOADING

复合材料在负载下的降解

• 批准号: 6238359
• 负责人: DANIEL A GIVAN
• 金额: $ 5.3万
• 依托单位: UNIVERSITY OF ALABAMA AT BIRMINGHAM
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 1998-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6238359
• 关键词: biomaterial evaluation; biomechanics; composite resins; dental material wear; dental materials; mechanical stress; biomaterial evaluation; biomechanics; composite resins; dental material wear; dental materials; mechanical stress

UDMA and bis-GMA matrix composite materials have been widely used as a dental restorative material for more than three decades. Clinical problems including poor wear resistance have led to development of a variety of differing composite constructions. Additionally, emphasis has been given toward the development of in vitro methods to predict clinical wear performance. The Alabama Dental Wear Simulator has been demonstrated to be a reasonable predictor of clinical performance. This device applies cyclic axial and tangential loading on the material surface via a high modulus stylus. However, little is known of the complex stress and strain distributions within the composite material when subjected to this loading environment and the resultin mechanisms of material loss. The purpose of my proposed research is to investigate the relationships of axial and rotational loading from the simulator to the specific microstructural and ultrastrucural mechanisms of composite material degradation under loading. Specifically, a series of bis-GMA composites with varying weight percent of both spherical or irregular particulate reinforcements will be investigated to determine the role of filler content from the monophase polymer. Correlations of observed wear to physical, chemical, and mechanical properties are anticipated. Analytical and finite element models will be constructed to contrast theoretical stress distribution to the laboratory data. The result of this study should new mechanistic understudying of the degradation of particulate polymer matrix composite structures under this loading profile and would be useful for future design optimization of the composite restorative materials.

UDMA和BIS-GMA基质复合材料已经 被广泛用作牙科修复材料已有三十多年了。 临床问题在内，包括耐磨性不佳导致发展 各种不同的复合结构。 另外，重点 已经为开发体外方法提供了预测 临床磨损性能。 阿拉巴马州的牙齿穿着模拟器已经 证明是临床性能的合理预测指标。 这 设备在材料表面上施加环状轴向和切向负载 通过高模式手写笔。 但是，对复杂的压力知之甚少 并在复合材料内的应变分布 这种加载环境和材料损失的结果机制。 我提出的研究的目的是调查 从模拟器到特定的轴向和旋转负载 复合材料的微观结构和超结构机制 加载下的降解。 具体而言，一系列BIS-GMA复合材料 球形或不规则颗粒的重量百分比不同 将研究增援部队以确定填充物的作用 来自单相聚合物的含量。 观察到的磨损的相关性 预计物理，化学和机械性能。 分析 将构建有限元模型以对比理论 压力分布到实验室数据。 这项研究的结果 应应对颗粒降解的新机械化 在此加载曲线下的聚合物基质复合结构，将 对于复合修复的未来设计优化有用 材料。