关键词: 陶瓷, 基底-瓷界面, 基底材料, 元素扩散

Abstract: Objective    To observe the changes of chemical elements between the different base material and the veneering porcelain with the electron probe，and analyze the pattern of chemical combination of the different base material and the veneering porcelain. Methods    Using the maxillary lateral incisor as a model，Ni-Cr alloy，zirconia，the Au-Pd alloy，press casting ceramic，Co-Cr alloy and mixed Au-Pd alloy base crown were selected and fired opaque and body porcelain respectively according to the recommended procedures by manufacturere. The thickness of ceramic layer was controlled with in 2mm on the labial side. The experimental sample was cut with the low speed diamond saw. Grind， polish and ultrasonically clean the cut surface. The zirconia sample and press casting porcelain sample were sprayed with gold in vacuum. Then observe the interface with electron microscopy， and analyze the situation of the elements exchange and transfer with the line scan and point scan of electron probe in the interfacial depth of about 10 μm. Results    Element diffusions appeared between the Ni-Cr alloy，zirconia，the Au-Pd alloy，Co-Cr alloy，mixed Au-Pd alloy base crown and veneering porcelain. Some elements could penetrate into veneering porcelain in the range of 1-2 μm，and the extent of element diffusion weakened until it disappeared with the increase of depth. The interface of press casting porcelain crown and veneering porcelain was not found. Conclusion    The composition between press casting crown and veneering porcelain is homogeneity. There is chemical combination between the 5 kind of base crown and the veneering porcelain during the process of firing.

Key words: ceramic, base-porcelain interface, base crown, element diffusion