Example 12
In another embodiment of Method 2, the second coloring liquid is not mixed with the adhesive solution. First, the zirconia base after surface roughening treatment is colored with the second coloring liquid. When the color of the zirconia base is observed to be consistent with that of the patient's teeth, coloring is stopped, the zirconia base is oven-dried and then soaked in the adhesive solution for 1-20 min, so that the adhesive solution seals the coloring liquid in the pores of the zirconia and fills the pores on the surface of the zirconia to form a protective film on or over the surface of the zirconia ceramic, which prevents bacteria, enzymes and other substances in the oral cavity from entering the pores and causing infection and other hazards. Finally, the zirconia base is taken out, put into a denture sintering furnace, heated up to 1530° C. at a rate of 5° C./min, kept at this temperature for crystallization for 120 min, and then cooled down along with the furnace.
