Lehner C R, Schärer P
University of Zurich.
Curr Opin Dent. 1992 Jun;2:45-52.
Despite the good appearance and biocompatibility of dental porcelains, failures are still of considerable concern because of some limited properties common to all-ceramic crown systems. As in the years before, pertinent scientific articles published between November 1990 and December 1991 focused on strengthening mechanisms and compared fracture toughness for different ceramic systems by using various test methods. Some evaluated the clinical implications thereon for seating and loading crowns and measured wear against different ceramic surface conditions. Recently introduced with pleasing aesthetic qualities, IPS-Empress (Ivoclar, Schaan, Liechtenstein), a new European leucite-reinforced glass-ceramic, has finally drawn attention in some journals and has been reviewed with promising in vitro test results. Using a simple press-molding technique, well-fitting crowns, inlays, and veneers can be fabricated without an additional ceramming procedure. Again, only long-term clinical trials will validate achievements compared with other all-ceramic systems and with well-established metal ceramics.
尽管牙科陶瓷外观良好且具有生物相容性，但由于所有全瓷冠系统都存在一些有限的特性，失败情况仍然备受关注。与过去几年一样，1990年11月至1991年12月发表的相关科学文章聚焦于强化机制，并通过各种测试方法比较了不同陶瓷系统的断裂韧性。一些文章评估了其对全冠就位和加载的临床意义，并测量了在不同陶瓷表面条件下的磨损情况。最近推出的具有令人满意美学品质的IPS-Empress（义获嘉，沙恩，列支敦士登），一种新型欧洲白榴石增强微晶玻璃，终于在一些期刊上引起了关注，并因其体外测试结果良好而得到了综述。使用简单的压模技术，可以制作出贴合良好的全冠、嵌体和贴面，无需额外的烧结程序。同样，只有长期临床试验才能验证与其他全瓷系统以及成熟的金属陶瓷相比所取得的成果。
