RESTORATIVE MATERIAL WEAR FACTORS

将复合树脂修复材料引入牙科 大约30年前的职业。从那时起，逐渐地 这些材料性能的改进使新的 可能的治疗方式。在过去的几年里， 这些材料的临床失效模式，部分原因是材料 改善，部分归因于更积极的治疗计划。 这些材料的性能依赖于强化和 添加硅烷偶联剂增韧有机基质 一杯陶瓷颗粒。最近，纤维增强修复材料 材料已经被介绍。尽管有相当数量的数据 已经收集了关于基质固化的影响，填充物许可证 新型复合材料的合理设计。填充剂基质的处理 相间弹性性能受到实验的阻碍 困难。尽管其快速断裂、疲劳和磨损行为 专有的和实验性的复合材料已经研究过，有一种 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 其他易碎的牙科修复材料。 这项研究的长期目标是开发和测试一个模型 结合材料的力学性能，有限元 技术，以及可用于设计的统计方法 新型修复复合材料。在追求中，提出了六个具体目标： 1)生产和表征一系列模型复合材料，使用 60：40双GMA：TEGDMA树脂基质和球形或纤维状的硼硅酸盐 玻璃填充剂.变量包括填充物、硅烷的体积分数 偶联反应和聚合反应动力学；生产一系列的 填充体积分数较低但填充量过大的复合材料 为了研究浆料对填料-基质粘结的影响，残留量 I型应力、基体塑性与磨损裂纹扩展 方向；3.)微结构有限元模型的有序精化 预测材料的弹性性能、强度和韧性 复合材料；4.)构建基于有限元的分析模型 它能够预测裂纹的扩展方向 复合材料；5.)发展统计和断裂力学 评价球形砂浆加固能力的方法 随机短切纤维和机织纤维增强；6.要使用 CARE/LIFE软件包，将骨折和疲劳数据作为输入，以 预测复合材料、粘性玻璃离子和 聚酸改性树脂复合体用于修复 某些空洞准备工作。

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.