RESTORATIVE MATERIAL WEAR FACTORS

修复材料磨损因素

• 批准号: 6497915
• 负责人: George R. Baran
• 金额: $ 26.44万
• 依托单位: TEMPLE UNIV OF THE COMMONWEALTH
• 依托单位国家: 美国
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 2003-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6497915
• 关键词: biomaterial development /preparation; biomaterial evaluation; composite resins; dental material wear; elasticity; glass; polymers; silicates; tensile strength

Composite resin restorative materials were introduced to the dental profession approximately thirty years ago. Since that time, incremental improvements in the properties of these materials have made new treatment modalities possible. There have been gradual changes in the clinical failure modes of these materials, due in part to material improvements, and in part to more aggressive treatment planning. The properties of these materials rely on the strengthening and toughening of an organic matrix through the addition of silane-coupled glass of ceramic particles. Recently, fiber-reinforced restorative materials have been introduced. Although a considerable amount of data has been collected concerning the effects of matrix cure, filler permit the rational design of new composites. Manipulation of filler-matrix interphase elastic properties has been hindered by experimental difficulties. Although the fast-fracture, fatigue, and wear behavior of proprietary and experimental composites have been studied, there is a lack of a design criterion or probabilistic mechanical approach that would enable estimation of the clinical lifetimes of composites and other brittle dental restorative materials. The long-term goal of this research is to develop and test a model incorporating mechanical properties of materials, finite element techniques, and statistical methods that could be used for the design of new restorative composites. In pursuit, six specific aims are proposed: 1.) to produce and characterize a series of model composites utilizing a 60:40 BISGMA:TEGDMA resin matrix and a spherical or fibrous borosilicate glass filler; variables include volume fraction of iller, silane coupling, and polymerization kinetics; 2.) to produce a series of composites with low filler volume fractions but with exaggerated filler sizes in order to study effects of filler-matrix bonding, residual stress, and matrix plasticity on Mode I and wear crack propagation direction; 3.) to refine a microstructural finite element model in order to predict the elastic properties, strength, and toughness of composites; 4.) to construct a analytical model based on finite elements that is capable of predicting crack propagation directions in composites; 5.) to develop a statistical and fracture mechanics methodology for evaluating the reinforcing capability of spherical, random chopped fiber, and woven fiber reinforcement; 6.) to use the CARES/LIFE software package, with fracture and fatigue data as input, to predict failure probabilities of composites, viscous glass ionomers, and polyacid-modified resin composites when these are used to restore certain cavity preparations.

复合树脂修复材料被引入牙科 大约三十年前的职业。从那时起，增量 这些材料性能的改进已经产生了新的 可能的治疗方式。情况也逐渐发生了变化 这些材料的临床失效模式，部分归因于材料 改进，部分是为了更积极的治疗计划。 这些材料的性能取决于强化和 通过添加硅烷偶联剂来增韧有机基质 陶瓷颗粒玻璃。最近，纤维增强修复体 材料已介绍。虽然数据量相当大 已收集有关基质固化、填料许可的影响 新型复合材料的合理设计。填料基质的操纵 相间弹性性能受到实验的阻碍 困难。尽管快速断裂、疲劳和磨损行为 专有的和实验性的复合材料已经被研究过，有一个 缺乏设计标准或概率机械方法 将能够估计复合材料的临床寿命 其他脆性牙科修复材料。 这项研究的长期目标是开发和测试模型 结合材料的机械性能、有限元 可用于设计的技术和统计方法 新型修复复合材料。为此，提出了六项具体目标： 1.) 利用 60:40 BISGMA:TE​​GDMA 树脂基质和球形或纤维状硼硅酸盐 玻璃填料；变量包括填料、硅烷的体积分数 偶联和聚合动力学； 2.) 生产一系列 填料体积分数低但填料过量的复合材料 尺寸，以研究填料-基体粘合、残余物的影响 I 型应力和基体塑性以及磨损裂纹扩展 方向; 3.) 按顺序细化微观结构有限元模型 预测材料的弹性、强度和韧性 复合材料； 4.) 构建基于有限元的分析模型 能够预测裂纹扩展方向 复合材料； 5.) 发展统计和断裂力学 评估球形增强能力的方法， 随机短切纤维和编织纤维增强； 6.) 使用 CARES/LIFE 软件包，以断裂和疲劳数据作为输入， 预测复合材料、粘性玻璃离聚物的失效概率，以及 多元酸改性树脂复合材料用于恢复 某些空腔准备工作。