CERAMICS GROUP

本研究的主要目的是开发陶瓷， 作为牙科汞合金的替代品。 目前， 瓷嵌体由提供持久的 美观，并被用作牙科汞合金的替代品。 然而，在这方面， 它们的可接受性受到低断裂韧性的限制， 限制其临床可接受性的主要失效原因。 第二 问题是由于烧结过程中的收缩而导致的差的边缘配合。 虽然昂贵的处理设备是可用的，但所采取的方法 本发明旨在开发可通过简单方法加工的上级陶瓷， 技术，降低成本。 第一个项目涉及研究 可通过在蒸汽中水合而增塑的硅酸盐玻璃 高压灭菌器 以前的研究人员已经证明， 甚至是柔性玻璃， 硅酸盐玻璃结构。 第二个项目是继续研究 白榴石瓷的相变增韧， 含铯白榴石高温形式。 本项目资金 还获得了高级研究员奖。 白榴石瓷 是使用最广泛的牙科陶瓷。 第三项研究 涉及通过近净成形方法加工莫来石， 坚韧莫来石-ZrO 2复合材料 这将由受控制的 锆和铝合金的氧化导致体积 膨胀以补偿烧结收缩。 第四项研究 涉及先进的无宏观缺陷铝酸钙的开发 用作直接修复材料的水泥。 本研究探讨 为工业应用开发的新型化学结合陶瓷; 这些材料中的一些超过了目前直接使用的 修复材料。 这些实验水泥的成分是 类似于含有水合陶瓷的牙釉质的结构 在结构内具有少量的聚合物。

The main purpose of this research is to develop ceramics for use as posterior restorations as alternatives to dental amalgam. Currently, porcelain inlays are fabricated from porcelains that provide long lasting esthetics and are being used as alternatives to dental amalgam. However, their acceptance is limited by low fracture toughness and fracture is the major cause of failure which limits their clinical acceptance. A second problem is poor marginal fits due to shrinkage during sintering. Although expensive processing equipment is available, the approach taken here is to develop superior ceramics that can be processed by simple technology for lower cost. The first project involves the study of silicate glasses that can be plasticized by hydration in a steam autoclave. Previous researchers have demonstrated that stable, tougher and even flexible glasses result by incorporation of water into the silicate glass structure. The second project is to continue research on the transformation toughening of leucite porcelains by stabilizing the high temperature form of leucite with cesium. Funds for this project have been supplemented by a Senior Fellowship Award. Leucite porcelains are the most widely used type of dental porcelain. The third study involves the processing of mullite by near net shape methods to produce tough mullite-ZrO2 composites. This will be done by the controlled oxidation of zirconium and aluminum alloys which results in a volume expansion to compensate for the sintering shrinkage. A fourth study involves the development of advanced calcium aluminate macro-defect-free cements for use as direct restorative materials. This study investigates the new chemically bonded ceramics developed for industrial applications; some of these materials exceed the strength of currently used direct restorative materials. The composition of these experimental cements are analogous to the structure of dental enamel containing hydrated ceramics with small amounts of polymer within the structure.