Effects of Pre-Sintering Surface Treatment and Liner Application on the Shear Bond Strength of Zirconia and Pressable Ceramic

Abstract

This study was intended to investigate the effect of applying liner for chemical bonding and physical surface roughness created on zirconia by using a sandpaper before sintering on the bond strength between the two materials.Methods: Zirconia blocks were cut using a low-speed cutter. Plate-shaped specimen(6 6 3 ) was fabricated by sintering after giving surface roughness according to four kinds of sandpapers. Depending on whether or not to use liner, 60 specimens were divided into two groups ZN(non-liner), ZL(liner), and the two groups were subdivided into four groups respectively in accordance with sandpaper used, totaling eight groups(n=10). The surface roughness (Ra) values and shapes before sintering were observed, and shear bond strength after pressing ceramic plasticity was measured with a universal testing machine. For a test of the significance, a one-way ANOVA was performed, and Tukey's multiple comparison test was conducted.Results: The observation of the surface roughness was SB04(2.22 1.16 ), SB08(2.98 0.33 ), SB12(2.44 1.32 ), SB20(2.34 0.59 ) and SA04(2.34 0.67 ), SA08(1.28 0.90 ), SA12(2.03 1.60 ), SA20(2.19 1.73 ). In the case of ZN Group, the shear bond strength was ZN04(23.26 3.83 ), ZN08(21.76 2.33 ), ZN12(20.49 3.01 ), ZN20(24.98 4.22 ) (p<0.05). As for ZL Group, the shear bond strength was ZL04(25.09 5.67 ), ZL08(22.98 2.26 ), ZL12(21.54 5.70 ), ZL20(23.98 3.23 ) (p<0.05). Conclusion:The research results showed that the bond strength of Zirconia core and Pressing ceramic was further improved by physical surface treatment before sintering, rather than by chemical bonding through liner surface treatment.

Shear Bond Strength of Zirconia and Ceramics according to Dental Zirconia Surface Treatment

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