MATRIX AND FILLER ON COMPOSITE RESIN PROPERTIES

基体和填料对复合树脂性能的影响

• 批准号: 3088487
• 负责人: MARK W BEATTY
• 金额: $ 5.75万
• 依托单位: INDIANA UNIV-PURDUE UNIV AT INDIANAPOLIS
• 依托单位国家: 美国
• 财政年份: 1985
• 资助国家: 美国
• 起止时间: 1985-12-01 至 1990-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3088487
• 关键词: biomaterial development /preparation; biomaterial evaluation; composite resins; dental materials

Recent improvements in materials and techniques have given today's dentist an ability to provide quality esthetic dentistry at an unprecedented level. The materials most used for this purpose are composite resins, which consist of small inorganic filler particles embedded in a polymer matrix. The dramatic increase in popularity for these materials has been accompanied by a couple of noteworthy problems. First of all, the number of composite resin products currently available to the dentist are virtually countless and are continually changing in composition. This has resulted in a wide range of formulations differing from each other with respect to polymer chemistries, filler particle sizes and fractions of filler introduced into the polymer matrix. The effects of varying these parameters are largely unknown. A second problem is the increased patient demand for dentists to place these materials not only in highly visible anterior teeth, but posterior teeth as well. Unfortunately, clinical data on older formulations indicate that a rapid wearing away of material occurs when they are subjected to heavy chewing forces. Furthermore, clinical data on present day composites are limited since a considerable investment in time, manpower and money is required to keep pace with these rapidly changing materials. In an attempt to gain some insight into these problems, one goal of this investigation is to evaluate a number of physical properties in a group of experimental composite resins in which the polymer chemistries, filler particle sizes and filler volume fractions are controlled. A second major objective is to study the sliding wear process on these materials when they are worn in a laboratory pin-on-disc machine. To date, data has been collected on a group of unfilled polymers with controlled chemistries. Resistance to sliding wear increases when the number of functional carbons present in the monomer increases from 2 to 4 and when the fraction of a crosslinking agent is increased from 15% to 30%. These changes in chemistry do not appear to greatly affect strength, stiffness or water absorption of the polymers.

材料和技术的最新改进使 今天的牙医能够提供高质量的美学牙科， 前所未有的水平。 最常用于此目的的材料 是复合树脂，由小的无机填料组成， 嵌入聚合物基质中的颗粒。 急剧增加 随着这些材料的普及， 几个值得注意的问题。 首先， 目前牙医可使用的复合树脂产品包括 实际上是无数的，并且在成分上不断变化。 这导致了广泛的配方， 相对于聚合物化学、填料颗粒 引入到聚合物基质中的填料的尺寸和分数。 改变这些参数的影响在很大程度上是未知的。 一 第二个问题是病人对牙医的需求增加， 将这些材料不仅放置在高度可见的前牙中， 后牙也是。 不幸的是，老年人的临床数据 配方表明，材料的快速磨损 当它们受到沉重的咀嚼力时会发生。 此外，目前复合材料的临床数据有限 由于在时间、人力和金钱方面大量投资， 需要跟上这些快速变化的材料的步伐。 在 试图深入了解这些问题，一个目标是 这项研究是为了评估一些物理性质， 一组实验性复合树脂，其中聚合物 化学性质、填料颗粒尺寸和填料体积分数被 控制。 第二个主要目标是研究滑动磨损 当这些材料在实验室中穿着时， 销盘式机器。 到目前为止，已经收集了一组数据， 未填充的聚合物与控制化学。 抗 当功能碳数量增加时，滑动磨损增加 存在于单体中的量从2增加到4，并且当单体中的量从2增加到4时， 交联剂的分数从15%增加到30%。 化学上的这些变化似乎不会对 聚合物的强度、刚度或吸水性。