The objective of this study was to analyze the microstructure on the interface between zirconia/alumina composites and bio-coating glass. Four kinds of zirconia/alumina ceramics were selected as the research substrate while VITA alpha glass-ceramic as the coating-glass. Energy spectrum analysis, optical and electron scanning microscope were observed on the junction between substrate and coating glass. The volume fraction of each phase, grain shapes and sizes were determined from SEM micrographs. From the experiment we can find zirconia particles migrated into grain boundaries and located at three or four grain junctions of alumina particles. The ceramic microstructure of superficial zone is permeated by the glass through grain boundaries and partially dissolves the grains. Neither on a macroscopic level in a polished section, nor on a microscopic level in a fracture surface were cracks or porous areas detected. The homogeneous bond between Vita alpha glass-ceramic and Z/A composites are distinct. Therefore, this system composed of zirconia/alumina composites and Vita alpha coating-glass would satisfy matching properties of dental requirements and it has a great future to be used as all-ceramic restoration materials.

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1. Experimental investigation and crystal-field modeling of Er³⁺ energy levels in GSGG crystal
2. Effect of phase transformation on the junction between zirconia/alumina ceramics and commercial coating-glass