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本文介绍Hi-ceram陶瓷反3/4冠的实验室制作过程。Hi-ceram陶瓷修复体由高熔氧化铝作内层冠和传统资作外层冠所组成.本技术的要点是使用一种特殊的耐高温代型材料,其热膨胀系数与内层材料(Hi-ceram)和Vita瓷粉相同,这种代型材料可使瓷能直接在耐高温代型上塑形并烧烤。尽管其它烤瓷系统可被用于这种设计,但Hi-ceram内层既不需用不透明的金属帽状冠,也不需要透明的铸造玻璃陶瓷修复体而能提供足够的强度。当重度变色牙用较薄的半透明贴面修复时,最后的颜色很难预料,另一方面,Hi-ceram反3/4冠有足够
This article describes the Hi-ceram ceramic anti-3/4 crown laboratory production process. The Hi-ceram ceramic restorations consist of a fused alumina inner crown and a conventional crown as the crown.The main point of this technique is the use of a special high-temperature resistant substratum with a coefficient of thermal expansion that is proportional to the inner material (Hi -ceram) Same as Vita porcelain powder, this substitutability material enables porcelain to be molded and grilled directly on high temperature resistant castings. Although other porcelain systems can be used in this design, the Hi-ceram inner layer provides sufficient strength without the need for an opaque metal crown and no need for a transparent cast glass-ceramic restoration. When severe discoloration of the teeth with a thin translucent veneer repair, the final color is difficult to predict, on the other hand, Hi-ceram anti-3/4 crown enough