CERAMICS GROUP

这项研究的主要目的是开发用作 后牙修复作为牙科银汞合金的替代品。目前， 瓷嵌体是用能提供持久耐用的瓷器制成的。 美观，并被用作牙科汞齐的替代品。然而， 它们的接受度受到低断裂韧性的限制，而且断裂是 失败的主要原因，这限制了他们的临床接受。一秒钟 问题是，由于烧结过程中的收缩，边缘适合性很差。 尽管有昂贵的加工设备，但采取的方法 这里是开发一种可以用简单的方法加工的高级陶瓷 更低成本的技术。第一个项目涉及研究 可在水蒸气中水合而塑化的硅酸盐玻璃 高压灭菌器。之前的研究人员已经证明，稳定、更坚韧 甚至柔性玻璃也是通过在玻璃中掺入水而产生的 硅酸盐玻璃结构。第二个项目是继续研究 白榴石陶瓷相变增韧的稳定化 与铯形成的高温白榴石。这个项目的资金 此外，还获得了高级研究员奖。白榴石瓷器 是使用最广泛的牙科瓷器类型。第三项研究 涉及莫来石的加工，采用近净形方法生产 增韧莫来石-氧化锆复合材料。这将由受控人员完成 锆和铝合金的氧化会产生大量的 膨胀以补偿烧结收缩。第四项研究 涉及开发无宏观缺陷的高级铝酸钙 用作直接修复材料的粘固剂。这项研究调查了 为工业应用开发的新型化学结合陶瓷； 其中一些材料的强度超过了目前直接使用的强度 修复材料。这些试验性水泥的成分是 类似于含有水合陶瓷的牙釉质的结构 在结构中有少量的聚合物。

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.