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KMID : 0362419950330040693
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Journal of Korean Academy of Prosthodontics
1995 Volume.33 No. 4 p.693 ~ p.704
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Study on the surface morphologe and shear bond strength of In-Ceram core to resin cement after varing modes of surface conditioning
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Kim Yeung-Sug
Woo Yi-Hyung
Lim Ho-Nam
Choi Boo-Byung
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Abstract
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This study was performed to evaluate effective surface conditioning method of In-Ceram core to improve bonding with resin cement. The surface of each sample was abraded with glass bead for 20 seconds and then subjected to one of the following conditions : no modification, sandblasting with 50㎛ alumimum oxide powders for 20 seconds, etching with 20% hydrofluoric acid for 5, 10, and 15 minum (half of the etched samples were coated with silane), and sandblasting with 250㎛ aluminum oxide powders and silica coating with Silicoater MD system(Kulzer, Germany). The surface morphology changes were examined with scanning electronic microscope(SEM) and the shear bond strength of In-Ceram core samples to resin cement(Panavia 21, Kurayay, Japan) were measured. @ES It was concluded that: @EN 1. By SEM observation, 20% HF acid etching did not create clear microretentive structure and surface roughness diminished with increace in etching time. Sandblasting was more effective than 20% hydrofluoric acid etching in producing microretentive structure. 2. The bond strengths of all In-Ceram core samples surface conditioned were increased than that of control group. 3. Silica coating showed higher bond strength than etching with 20% hydrofluoric acid. 4. The use of silane coating was more effective in improving bond strength than lengthening etching time.
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