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KMID : 1023420130130030290
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Journal of Dental Hygiene Science
2013 Volume.13 No. 3 p.290 ~ p.295
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A Study on the Shear Bond Strength of Veneering Ceramics to the Lithium Disilicate (IPS e.max CAD) Core
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Kim Ki-Baek
Kim Jae-Hong
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Abstract
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The purpose of this study was to investigate the shear bond strength between various commercial all-ceramic system core and veneering ceramics,and evaluate the clinical stability by comparing the conventional metal ceramic system. The test samples were divided into three groups: Ni-Cr alloy (metal bond), yttria-stabilized, tetragonal zirconia polycrystal (Y-TZP) (zirconia bond), lithium disilicate (lithium disilicate bond). The veneering porcelain recommended by the manufacturer for each type of material was fired to the core. After firing, the specimens were subjected to shear force in a universal testing machine. Load was applied at a crosshead speed of 0.50 mm/min until failure. Average shear strengths (mega pascal)were analyzed with a one-way analysis of variance and the Tukey test (α=0.05). The mean shear bond strength±SD in MPa was 44.79±2.31 in the Ni-Cr alloy group, 28.32±4.41 in the Y-TZP group, 15.91±1.39 in the Lithium disilicate group. The ANOVA showed a significant difference among groups (p＜0.05). None of the all-ceramic system core and veneering ceramics could attain the high bond strength values of the metal ceramic combination.
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KEYWORD
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Dental computer-aided design and computer-aided manufacturing, Lithia disilicate, Bond strength, Zirconium oxide
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