The aim of this research was to investigate difference in shear bond strengths of full-contour zirconia layered with porcelain.Methods: Disk-shaped (diameter: 12.0 ; height:3.0 ) zirconia were randomly divided into six groups according to the surface conditioning method to be applied (N=90, n=15 per group): group 1-contol group(ZC); group 2airborne particle abrasion with 50-Al2O3(5A); group 3-50-Al2O3 + liner(5AL), group 4-110-Al2O3(1A); group 5-110-Al2O3 + liner(1AL); group 6-liner(LC). On each block, zirconia porcelain was build up according to manufacturer's instructions. All samples were fixed with measuring jigs and shear bond strength were measured with Universal testing machine. Collected data were analyzed using SPSS(Statistical Package for Social Sciences) Win 12.0 statistics program.Results: LC showed the highest value(29.92 2.55 ) and ZC showed the lowest value(13.22 1.37 ). Zirconia liner and Alumina oxide groups was significantly higher shear bond strength than control(p<0.05). 5A (without liner 22.18 2.37, with liner 22.84 1.74 ) was higher shear bond strength than 110 (without liner 20.18 2.38, with 20.71 2.67). Conclusion:Surface treatments may have advantage in bond strength improvement for full-contour zirconia layered with porcelain.
Health College * Purpose: It is to compare and evaluate the change of the wear rate and phase variation of the Zirconia before and after the sintering after the grinding by a high speed equipment manufactured for the Zirconia.Methods: The specimen of the sintered Zirconia was manufactured as size of 15 15 2 . The grinding has been applied to each of all pieces of each test groups for a minute fit for each condition at same speed of 50,000 rpm by a diamond bur at high speed handpiece with injection of the air and water. For the observation of the surface before and after the sintering of the each test piece, the cross section of it was observed as 100 magnification by a scanning electron microscope after it was coated by PT, and the diffraction analysis was performed by XDR to compare the crystal phase of the Zirconia. The average surface roughness value of all specimens were evaluated. The wear test was performed at room temperature by applying a load of 1kg for 120,000 cycles for the chewing period 6 months. Wear was analyzed for the enamel cusps by measurement of the vertical substance loss with a laser scanner.Conclusion: The phase variation from the tetragonal phase to the monoclinic phase was confirmed in the test group of the pre-sintered Zirconia after the grinding, and the value of the surface roughness and the wear rate was increased in experimental group.[Abstract] 157
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