Abstract
This study was intended to investigate the effect of applying liner for chemical bonding and physical surface roughness created on Yttria-toughened zirconia (YTZ core) by using a polishing tool before sintering on the bond strength between the two materials. YTZ blocks(Fine Base, K&F, Korea, 15mm×15mm ×4mm) were cut using a low-speed cutter. Plate-shaped specimen (6mm×6mm×3mm) was fabricated by sintering after giving surface roughness according to three kinds of polishing tools. Depending on whether or not to use liner, 60 specimens were divided into two groups ZP(non-liner), ZLP(liner), and the two groups were subdivided into three groups respectively in accordance with polishing tools used, totaling six groups (n=10). The surface roughness (Ra) values and shapes before sintering were observed, and shear bond strength after veneer ceramic plasticity was measured with a universal testing machine. For a test of the significance, a one-way ANOVA was performed, and Tukeys multiple comparison test was conducted. The observation of fracture surfaces using an optical microscope revealed that the surface roughness was SZ(1.10±0.76㎛) 0.05). The research results showed that the bond strength of YTZ core and veneering ceramic was further improved by physical surface treatment before sintering, rather than by chemical bonding through liner surface treatment.
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